i search for library esp2866

when i run my con on ide arduino i get error compiler and this is message

Arduino: 1.6.8 (Windows 7), Board: “Arduino/Genuino Uno”

C:\Users\mohamad\AppData\Local\Temp\arduino_modified_sketch_265920\BareMinimum.ino:1:25: fatal error: ESP8266WiFi.h: No such file or directory

#include <ESP8266WiFi.h>

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.

https://github.com/esp8266/Arduino

That library is part of the hardware package that ieee488 posted a link to. It is only available when one of the boards of that package are selected and can only be used for directly programming one of those boards, not an Uno.