1. Sets

Sets Run Your Digital Life

Right now, sets are working behind the scenes:

Your WhatsApp groups? Each is a set of people.

Your Spotify 'Liked Songs'? A set of tracks.

Netflix recommendations? Sets of movies you might like.

Google search results? A set of matching web pages.

Every app, every database, every algorithm uses sets.

The Golden Rule

For ANY collection to be a set, this must be true:

Can you clearly decide if something belongs? YES or NO?

No 'maybe'. No 'depends'. No opinions.

Everyone must agree on what's in and what's out.

This is called being well-defined.