What is data privacy?
In one line
Ages 8 to 10: Data privacy means your name, photos and where you live are yours, and you can say no to sharing them.
Ages 11 to 13: Apps and AI tools collect data to work, and permissions and privacy settings let you choose what they get.
Ages 14 to 18: Data privacy is about collection, use, sharing and keeping of personal data, including what AI systems store, train on or infer about you.
Data privacy means having a say over information about you: who collects it, what they use it for and who they share it with. Personal data includes your name, address, phone number, photos, voice and where you are. Apps, websites and AI tools may ask for it, and you can often say no.
Last reviewed: 20 October 2026 7 min read
The idea in one picture
Think of your information like the things in your backpack. Some things you show anyone, like your favorite color. Some you share only with people you trust, like your phone number. Some stay zipped away, like your home address. Data privacy is deciding who gets to look in which pocket, and being able to say "no thanks".
Worked example. A drawing app asks to use your location, your contacts and your photos. Drawing needs your photos only if you want to add one. It does not need your location or contacts. You can choose "Don't allow" for those and still draw.
How it works, step by step
- An app, website or AI tool asks for information, or collects it while you use it.
- Some data you type in yourself, like your name or a message. Some is collected in the background, like your location or which device you use.
- The company stores it and uses it for the reasons in its privacy policy, which can include improving its products or showing ads.
- It may share the data with other companies, if its policy allows.
- You or a parent can often limit this: turn off permissions, change settings, ask for data to be deleted, or not use the app.
A little deeper (ages 11 to 13)
Personal data is more than your name. It includes your email, phone number, photos, videos, voice recordings, where you are, and codes that identify your device. Bits that seem harmless can add up: a first name, a school team and a photo of your street can be enough to find someone. That is why it helps to share the least you can. With AI tools, what you type may be stored. A tool's privacy policy should say what it keeps and whether it uses your words to train its AI.
Going further (ages 14 to 18)
Privacy covers four questions: what is collected, how it is used, who it is shared with, and how long it is kept. AI adds new twists. Some AI systems are trained on huge amounts of data, which can include personal data, and makers often don't say exactly which sources they used. Models can sometimes repeat pieces of their training data, and they can guess, or infer, sensitive facts by combining scattered information, even when the guess is wrong. In the United States, the COPPA Rule requires covered sites and apps to get a parent's consent before collecting personal information from children under 13.
Common mix-ups
- Mix-up: "I have nothing to hide, so privacy doesn't matter."Fact: Privacy is about control, not secrets. Your address isn't a secret, but you still choose who gets it.
- Mix-up: "Deleting a post deletes it everywhere."Fact: Others may have copied or saved it already.
- Mix-up: "Free apps don't collect anything."Fact: Many free apps collect data; the privacy policy says what and why.
- Mix-up: "Private chat with an AI is like a diary."Fact: What you type may be stored by the company that runs the tool.
What to do about it
- Share the least you can. Never share your full name, address, school, passwords or photos with an AI tool or a stranger's form.
- Check permissions. In your device's privacy settings, see what each app can access, such as location, contacts or photos, and turn off what it doesn't need.
- Read before you agree, together with a parent: what does the app collect, and does it share or use it to train AI?
- Say no. You can choose "Don't allow", skip optional questions, or not use an app that asks for too much.
- Parents of children under 13 in the US can ask covered sites and apps to show what they collected, withdraw consent at any time and have it deleted.
- Tell a trusted adult if an app, website or person keeps asking for personal details.
This is general guidance, not legal advice. Laws differ by country and state.
Try it (no device, 5 minutes)
Pocket sort. Write ten labels on scraps, not the real details: "favorite food", "full name", "home address", "birthday", "pet's name", "school name", "a photo of your face", "password", "favorite band", "where I'll be on Saturday". Sort the labels into three piles: "OK for anyone", "Only people I trust", "Keep private". Compare piles with a parent. Did you agree? Which item surprised you most?
Quick check
Name three kinds of personal data.
Answer: For example: full name, home address, phone number, photos, voice recordings, location.
For example: full name, home address, phone number, photos, voice recordings, location.A flashlight app asks for your contacts. What can you do?
Answer: Choose "Don't allow"; a flashlight doesn't need your contacts. If it won't work without them, use a different app.
Choose "Don't allow"; a flashlight doesn't need your contacts. If it won't work without them, use a different app.(Ages 14 to 18) How can an AI system reveal something you never told it?
Answer: By combining scattered information to infer it, or by repeating data it was trained on.
By combining scattered information to infer it, or by repeating data it was trained on.Questions
Data privacy means having a say over information about you: who collects it, what they use it for and who they share it with. It is about control, not about having something to hide.
Personal data includes your full name, home address, email, phone number, photos, videos, voice recordings, where you are and codes that identify your device. Small details can add up, so share as little as you can.
Information shared online can be stored, copied and used in ways you didn't expect, and it can be hard to take back. Sharing less and checking settings helps children and teens stay in control of what others know about them.
Choose "Don't allow" when an app asks for access it doesn't need, such as location or contacts, and skip optional questions. If an app won't work without too much data, ask a parent and pick a different one.
Some AI tools store what you type, and some use it to improve or train their AI. Check the tool's privacy policy and settings with a parent, and never share personal details such as your full name, address or school.
Under the US COPPA Rule, covered sites and apps must get a parent's consent before collecting personal information from a child under 13. Parents can review what a covered site or app collected, withdraw consent at any time and have it deleted. This is general guidance, not legal advice.
Mechna Academy is a city of machines for curious children aged 8 to 18, opening first to ages 8 to 10. In each mission, a child guesses how a machine decides, then opens its Peek Hatch to check, changes one thing and tests it on a case it has never seen. Children learn how AI works this way, and they never chat with an AI.
For grown-ups: join the waitlistPlaces are limited. The waitlist is for parents and guardians 18 and older.