Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
I think it isn't the title of a book that kind of thing.
Usually "Mobile titles" refers to applications,games,etc. created for mobile devices such as Android and IOS(better known as "Smartphones")
Required, but never shown