Football
The French word 'Football' is used exactly as in English, to refer to the sport which involves two teams trying to score points by hitting a ball into the opponents' goal using any body part except their hands and arms. In some contexts, it might also refer to the ball used in this sport.
I like playing football on the weekend.
This sentence is an expression of the speaker's personal preference for engaging in football as an activity, especially over the weekend.
Football is a very popular sport in France.
This sentence emphasizes the popularity of football as a sport within the French community - it implies that a considerable part of the French populace have football as their sport of choice.
We won the football match yesterday.
This sentence is a past event narration in which the speaker's team had a victory in a football match the day before - it suggests that there was a football event that had the speaker's side as the winners.