If something is intuitive, this means that it is easy to use without a lot of instruction or learning time.
As an example, an intuitive interface or website has a way of navigating the website or product that makes sense to the user without them needing to read help documentation or spend a lot of time looking for what they need to complete a task.
This is accomplished by using standard models for navigation, interaction, and engagement so that users can recognize familiar patterns and do not need to try to figure out a new interaction model.