The three-click rule is a design rule for websites that states that all content on a website should be accessible within three clicks from the homepage. The rule is intended to ensure that users can access the desired content quickly and efficiently without having to click through too many submenus.

However, the three-click rule is considered outdated by many experts, as it is not always practical or sensible. For example, with large and complex websites, it can be difficult to make all content accessible within three clicks without making navigation confusing.

Instead, it is recommended to focus on meaningful and user-friendly navigation that allows users to find the desired content on the website quickly and easily. A well-designed navigation should be clear and intuitive and emphasise the most important content.