What does “check” mean in chess?

Which piece can deliver a check and also jump over others?

What is a “checkmate”?

What is the quickest possible checkmate called?

Can a king give a check to the opposing king?

Can a pawn deliver a check?

Which tactic involves two pieces delivering check at the same time?

How many squares are there on a standard chessboard?

Which piece can move any number of squares in any direction?

Which color moves first in a chess game?