A knife (plural knives) is a tool with a cutting edge or blade, hand-held or otherwise, with most having a handle.
Many types of knives are used as tools, such as the combat knife carried by soldiers, the pocket knife carried by hikers and the hunting knife used by hunters. Knives are also used as a traditional or religious implement, such as the kirpan.
Some types of knives are used as sports equipment (e.g., throwing knives).
Knives are also used in agriculture, food harvesting etc.; the sickle, the scythe and even the combine harvester are knives.