Click depth is the number of clicks it takes to go from a homepage to another page on a website. We can assign numerical values to the different pages on a site, based on their distance from the homepage.
The homepage can be assigned 0. Any pages linked on the homepage have a depth value of 1.
Ideally, your most important content should be within three clicks from the homepage. Further than this, it becomes more difficult for users and bots to locate these pages. User experience best practice states you must make it easy for users to find the content they need as fast as possible.