what a screen?

here is the definition Screen is a free terminal multiplexer developed by the GNU Project. It allows a user to access multiple separate terminal sessions inside a single terminal window or remote terminal session. It is useful for dealing with multiple programs from the command line, and for separating programs from the shell that started the program. Multiple terminal sessions can be created, each of which usually runs a single application. The windows are numbered, and the user can use the keyboard to switch between them. Some GUI terminal emulators provide tabs or otherwise similar functionality to this. Each window has its own scroll-back buffer, so that output is captured even when the window isn't actively displayed, and that history can be saved even when migrating to another computer. Windows can be split-screened. While some text applications have this functionality built in, Screen allows any application to be horizontally split-screened alongside any number of other applications. Session Sharing Screen allows multiple computers to connect to the same session at once, allowing collaboration between multiple users. The same computer can also be used to make multiple simultaneous connections, providing alternative functionality to screen-splitting, particularly for computers with multiple monitors.

i am using TFT 19'inch

The definition of a computer screen is: A computer display, monitor or screen is a computer peripheral device capable of showing still or moving images generated by a computer and processed by a graphics card. Monitors generally conform to one or more display standards. Sometimes the name "display" is preferred to the word "monitor", as the latter is perceived to be ambiguous alongside the other senses of "monitor" meaning "machine-level debugger" or "thread synchronization mechanism". The word screen also has the following definitions: a white or silvered surface where pictures can be projected for viewing blind: something that keeps things out or hinders sight; "they had just moved in and had not put up blinds yet" test or examine for the presence of disease or infection; "screen the blood for the HIV virus" display on the surface of the large end of a cathode-ray tube on which is electronically created examine methodically; "screen the suitcases" a covering that serves to conceal or shelter something; "they crouched behind the screen"; "under cover of darkness" examine in order to test suitability; "screen these samples"; "screen the job applicants" protective covering consisting of a metallic netting mounted in a frame and covering windows or doors (especially for protection against insects) project onto a screen for viewing; "screen a film" prevent from entering; "block out the strong sunlight" sieve: a strainer for separating lumps from powdered material or grading particles screen door: a door that consists of a frame holding metallic or plastic netting; used to allow ventilation and to keep insects from entering a building through the open door; "he heard the screen slam as she left" riddle: separate with a riddle, as grain from chaff partition consisting of a decorative frame or panel that serves to divide a space shield: protect, hide, or conceal from danger or harm