Tool sets are collections of tools that are packaged together for a specific purpose. The term 'tool sets' can refer to a variety of different types of kits, such as those used for gardening, carpentry, or automotive repair. The crossword solution for the term 'tool sets' is 'KITS, ' which is an acronym for 'Keep It Together Sets.' These sets are designed to keep all the necessary tools in one place, making them easier to store and transport.