Crosswords are a popular form of word puzzle that have been around for many years. They often involve filling in words or phrases into a grid of empty squares, with clues provided to help the solver. The term 'CROSSWORDS ARE OFTEN SOLVED IN THEM' refers to the fact that crosswords are usually solved in newspapers, magazines, or other publications. This is because the clues and answers are printed in the same publication, making it easier for the solver to find the correct answer.