The word algorithm appears everywhere. In news articles, in school conversations, in debates about social media and children's safety.
But most parents have never been given a simple, honest explanation of what an algorithm actually is.
This guide does that. No jargon. No panic. Just a clear explanation of what algorithms are, how they work, and why they matter to anyone raising children in a digital world.
An algorithm is not magic. It is not mysterious. It is a set of rules for making decisions.
What is an algorithm?
An algorithm is simply a sequence of instructions for making a decision or completing a task.
You already use algorithms every day without calling them that.
A recipe
Step by step instructions to produce a result
A satnav
Rules for choosing the fastest route
A school timetable
Rules for organising time and resources
The difference online is that digital algorithms make millions of decisions per second, invisibly, at enormous scale.
What does an algorithm do online?
Online algorithms are used to rank, sort and filter. They take a huge amount of information and apply a set of rules to decide what appears, in what order, to which person.
Every major platform runs on them:
Ranks billions of pages to decide which ten appear at the top of your results.
Decides which videos play next on your For You page, based on rules about engagement.
Chooses which videos appear in your sidebar and autoplay queue.
Orders your feed and decides which posts appear first.
Arranges the homepage so that certain titles appear prominently for each user.
Selects tracks for Discover Weekly and Daily Mix playlists.
When your child opens an app, they are not seeing the internet. They are seeing a version the algorithm has arranged for them.
How does an algorithm make its decisions?
Algorithms make decisions based on signals — pieces of data that indicate what a person is likely to respond to.
These signals are gathered from behaviour, not from what someone says they like. The algorithm watches what people do.
These signals are fed into the algorithm's rules, which then produce a ranked output: content ordered by how likely it is to keep that person engaged.
The algorithm isn't deciding what's good for your child. It's deciding what keeps them watching.
What this looks like at home
Because algorithms learn from behaviour, patterns can form quickly — and often invisibly.
A child watches one video of a footballer doing a trick.
The algorithm registers engagement. It shows another. Then another. Then training videos, then highlight reels. The child did not ask for a football world. The algorithm built one based on one click.
A child pauses on a video about skincare.
A pause is a signal. The algorithm may show morning routines, product hauls, beauty tutorials. None of this was searched for. The algorithm inferred interest from a moment of hesitation.
A child watches gaming clips late at night.
The algorithm learns that this person watches gaming content at a certain time. It may prioritise that content at that hour. The pattern reinforces itself.
The algorithm is not targeting your child maliciously. It is applying its rules. But those rules were written to maximise engagement, not wellbeing.
An important thing to understand
Algorithms are one part of how the internet works. They are the rules that rank and sort content.
But other forces also shape what appears online — including how content is paid for, how data about behaviour is collected and used, and how platforms are designed to hold attention.
Algorithms answer the question:
"What should I show this person next?"
The rules that answer that question are shaped by many things — and understanding algorithms is the first step to understanding the bigger picture.
What parents can actually do
The aim is not to monitor every click. It is to help children understand that the content they see is not random — it is the result of rules, and those rules can be questioned.
Useful questions to start with at home:
Why do you think this app showed you this?
Did you click on something similar recently?
Do you think the app chose this for you, or did you choose it?
Does your feed look different from mine?
What do you think the algorithm wants you to do next?
Would you like to change what it shows you?
Parent takeaway
Algorithms are not magic. They are rules. And like all rules, they can be understood, questioned and — once you see how they work — navigated.
The most powerful thing a parent can do is help their child see the rules that are shaping their world.