On thing that makes association football popular is that it can be played with relatively little equipment, in almost any place.

You basically just need a ball. You can mark goals with some jumpers, stones, chalk or whatever, and you can play in a field, a park, a street or a backyard. You can play with 2, 5, 10 or 20 players.

By comparison, it's hard to play sports like tennis, golf, pool, hockey etc without more equipment and a dedicated playing area.

It's therefore easy for kids to play and learn