programming microcontroller, microcontrollers software, Input and output devices

Microcontroller manufacturers and programmable 8 bit microcontrollers. Wireless, usb, lcd, pic, embedded and low power 8 bit microcontrollers. What is an 8 bit microcontroller and its programming software. 

https://www.futureelectronics.com/p/semiconductors--microcontrollers--8-bit/pic16f873a-i-so-microchip-4788337