The Comprehensive Guide to User-Friendly Mobile Apps!

UI/UX Design
Your end users are the people at the end of the chain who actually use or consume your business's products and services. The products you're developing are ultimately for them.
Usability, Functionality and Usefulness are key aspects of user experience, focusing on the ease of use and value of a product, along with content relevance and product exploration ease.
Using Metaphors to enhance User Experience & design is to provides the user with instant knowledge of how to interact with the user interface.
Don't Make Me Think is a book by Steve Krug about human-computer interaction and web usability. The book's premise is that a good software program or web site should let users accomplish their intended tasks as easily and directly as possible.