Micro controller 8051 is a 8 bit device in embedded system application.it’s used extensively in the automated electronics field. if you do not know, what’s an embedded system.
Embedded system is a combination of hardware and software usually used to perform a specific task. Now a days, every electronics is an embedded system e.g. mobile phone, mp3 players, televisions, home security systems, car’s security system, cd-roms, hard-discs, stereo systems, robots etc. This list is endless and will never finish.