A small bet to get calls and increase the pot.

A bet made by a player who wants it to be called.

Simply put, if you believe the odds taken are better than the mathematical chance which the team involved has of pulling off the outcome, then you have a value bet. This means, that if a tennis player [..]

Is a bet made by a player when he is certain that he has a better hand tan his opponent, its objective is to try to get a last bet from this opponent. Therefore, we say that he "values" his hand.