The "L-Block" is a geometric shape commonly found in the game Tetris. It consists of four connected squares arranged in an "L" formation, with three squares in a vertical line and one square extending horizontally from the bottom. This shape can be rotated to fit into various spaces on the game board. In Tetris, players aim to fit falling blocks, including the L-Block, into complete horizontal lines. When a line is completed, it disappears, earning the player points. The L-Block is versatile and can be used strategically to clear multiple lines or fill gaps in the game grid.