What Application is

Used interchangeably with program and software, this is a general term for a program that performs specific tasks, such as word processing, database management, e-mail sending or retrieval, or Web browsing. Unlike system software, which maintains and organizes the computer system (such as the operating system), an app is an end-user program.

The meaning of LCD (Liquid Crystal Display)

The screen used on flat panel monitors, digital watches, PDAs, pagers, cell phones, and so on. It makes use of liquid crystals to display information.