Science & Technology 6 min read

How algorithms shape what you see online

Ever wondered why your videos, games and posts seem to know what you like? A hidden set of rules is choosing for you. Learn how it works, and how to stay in charge.

Written by LiteCapsule Learning

Open a video app and the first thing you see is a list of videos. Nobody asked you to pick them. Your friend might open the very same app and see something completely different.

That is not magic. It is an algorithm, and learning how it works is one of the best ways to stay in control of what you watch, read and believe.

Pixel art illustration of a smiling child holding a tablet full of video thumbnails while a small friendly robot sorter drops colourful cards onto the screen, with a magnifying glass on the ground
An algorithm is like a robot sorter that decides what to put on your screen next.

What is an algorithm?

An algorithm is just a set of step-by-step instructions, like a recipe. A recipe tells you how to make a cake. An algorithm tells a computer how to do a job.

Apps and websites use algorithms to sort through millions of videos, posts, songs and ads and decide which few to show you. There is far too much for anyone to look at, so the app picks for you.

How does it decide what to show you?

The algorithm watches what you do and makes a guess about what you will like. It notices things like:

What you click and watch

If you watch three videos about dinosaurs, you will probably be shown more dinosaurs.

How long you stay

Videos you watch all the way through count as a "win". Ones you skip count as a "miss".

What you like, share and comment on

Reactions tell the app what grabs your attention, whether you enjoyed it or not.

What people like you enjoy

If other people who watched the same things also liked something else, the app will probably show it to you too.

Why this matters

Algorithms can be very helpful. They can help you find a great song, a tutorial that explains something you were stuck on, or a new hobby. But they also have some tricky side effects:

  • The bubble effect. If you only see more of the same, you can miss other ideas, other opinions and other kinds of fun. This is sometimes called a filter bubble.
  • Built to keep you watching. Many apps make money from ads, so their algorithms are designed to keep you on the app for as long as possible.
  • Attention-grabbing beats accurate. Shocking or dramatic posts often get shown more than calm, careful ones, even when they are not true.
  • It is only a guess. The algorithm does not really know you. It cannot tell what is good for you.

A thought experiment

Imagine you ordered a pizza and the shop delivered pizza every day, forever, because you liked it once. That would be fun at first. Soon you would be missing out on salad, pasta, fruit and everything else.

A feed that only shows what you already like works the same way.

How to take control

You do not have to be a passenger. Here are some simple ways to steer your feed:

  1. Search on purpose. Type in what you want to learn about instead of scrolling for whatever turns up.
  2. Mix it up. Look for things outside your usual interests, like a new topic, country or hobby.
  3. Use the "not interested" button. Most apps have one. It teaches the algorithm what you do not want.
  4. Take breaks. Set a timer. When it goes off, stop and do something offline.
  5. Check more than one source. If a post makes you feel strongly, look for the story somewhere else before you believe or share it.
  6. Talk about it. Ask a parent, friend or teacher what they see. You might be surprised how different it is.

Algorithm words to know

A few handy words for talking about your feed:

Algorithm

A set of step-by-step rules a computer follows to do a job, such as choosing what to show you.

Feed

The list of videos, posts or pictures an app shows you, usually one after another.

Recommendation

A suggestion from an app that says "you might like this next".

Filter bubble

When you mostly see things you already agree with or enjoy, so you miss other ideas.

Engagement

How much you click, watch, like and share. Apps often try to boost it.

Think it through

Read each question, decide what you think, then click to reveal an answer.

You watch one scary video and now your feed is full of them. What happened?
The algorithm noticed you watched it and guessed you wanted more. It does not know if you liked it or were just curious. You can fix this by choosing "not interested" and searching for something you do enjoy.
Your friend sees different videos on the same app. Why?
Each person's feed is built from their own choices. Different clicks and watching habits lead to different feeds.
Why might an app want you to keep scrolling?
Many apps earn money from ads, so the longer you stay, the more ads you see. That is why it is a good idea to set your own limits.
A post makes you really angry and it is everywhere in your feed. What is a smart thing to do?
Pause. Posts that spark strong feelings often get shown more. Check whether it is true on a trusted site, and talk to someone before you share.
Can you change what an algorithm shows you?
Yes! Your choices teach it. Searching on purpose, picking "not interested" and exploring new topics all help.

The big takeaway

Algorithms are not good or bad. They are tools built by people, and they are very good at guessing what will keep you watching. You are better at deciding what is good for you.

Your feed checklist

  • I know an algorithm is choosing what I see.
  • I sometimes search for things on purpose.
  • I look for ideas that are different from mine.
  • I check big claims before I believe or share them.
  • I take breaks and decide when to stop.

You steer the feed. The feed does not steer you.

Keep exploring

More guides on staying smart, thoughtful, and safe online.