A fishing reel's capacity refers to the amount of fishing line it can hold. The capacity varies based on the reel type and size. Spinning reels typically have a line capacity ranging from 100 to 300 yards. Baitcasting reels, on the other hand, usually offer capacities between 120 and 200 yards. Larger, offshore reels can hold significantly more line, often up to 600 yards or more. It's essential to consider the type of fishing you plan to do when choosing a reel with the appropriate capacity. Remember, the reel's capacity affects both the amount of line you can use and the size of fish you can target. Make sure to check the specifications provided by the manufacturer to determine the reel's capacity that suits your needs.