A desktop wiki is a type of computer program that helps you store and organize information like a wiki online, but all on your computer. It's like having your very own personal online encyclopedia, in which you can save information, pictures, documents and thoughts, and everything is easy to search, access and update. This can be really helpful if you need to keep track of a lot of facts and ideas or create a timeline or a to-do list. You can also store things safely on your computer, rather than having them out in the open on the internet.