microcontroller is a small low cost system with a processor, memory &
peripherals that can be used as an embedded system. Microcontrollers
are used today are embedded lots of products & machinery some
common examples include mobiles, vehicles and almost all day to day
required household equipment. Using micrcontrollers you can interface
Input and output devices like relays, solenoids, latches, LCD
display, switches, and sensors like light, temperature humidity,
water level, various gas sensors etc.