A watchmaker is an artisan who makes and repairs watches. A modern watchmaker is more likely to repair a wristwatch or a pocketwatch than to actually create a watch from scratch. A skilled watchmaker can typically manufacture many of the parts found in a watch. A person who primarily repairs watches, especially if he is not qualified to make all components of a watch, should properly be called a watch repairer rather than a watchmaker.
A watchmaker, as the name implies, works primarily on watches, not clocks. Some watchmakers work on clocks, but the skills and tools needed to work on a watch are not always applicable when working on a clock.
Historically, in England, watchmakers would have to undergo a seven-year apprenticeship and then join a guild, such as the Worshipful Company of Clockmakers in London, before selling their first watch. In modern times watchmakers undergo training courses such as the ones offered by the BHI, or one of the many school around the word following the WOSTEP curriculum.