Xlib is a library used to communicate with X11 servers. This is the library that widget toolkits like GTK+, Qt, and Motif use to draw their graphics, and it's considered to be low-level.
Xlib is a library used to communicate with X11 servers.
This is the library that widget toolkits like GTK+, Qt, and Motif use to draw their graphics, and it's considered to be low-level. If you're looking for a high-level GUI toolkit, you're better off looking at those toolkits instead of using Xlib directly.
Xlib was first developed in 1985. The newer XCB library is intended to replace Xlib and take over its functions, but currently very few programs use XCB.