A crossword puzzle is a word game that involves filling in blank spaces with letters to form words, based on given clues.
Grid: The grid is the main structure of a crossword puzzle where you fill in the letters.
Clue: Clues are hints or questions provided alongside empty squares that help you determine the correct word for each space.
Across/Down: In a crossword puzzle, words are typically classified as 'across' or 'down' depending on their orientation.