Abstract this training report is all about the embedded systems and its application in various fieldin real world. we are living in the embedded world. we are surrounded with many embedded products like television, radio, cd player, washing machine or microwave oven in our kitchen, card readers, access controllers, palm devices of our work space enable us to do many of our tasks very effectively. apart from all these, many controllers embedded in our car take care of car operations between the bumpers. all kinds of magazines and journals regularly dish out details about latest technologies, new devices; fast applications which make us believe that our basic survival is controlled by these embedded products. now we can agree to the fact that these embedded products have successfully invaded into our world. what is this embedded system? theoretically, an embedded controller is a combination of piece of microprocessor based hardware and the suitable software to undertake a specific task. the 8051 is one of the most popular microcontrollers in use today. many derivative microcontrollers have since been developed that are based on—and compatible with--the 8051. thus, the ability to program an 8051 is an important skill for anyone who plans to develop products that will take advantage of microcontrollers. the 8051 is an 8-bit microcontroller which means that most available operations are limited to 8 bits. there are 3 basic "sizes" of the 8051: short, standard, and extended. the short and standard chips are often available in dip (dual in-line package) form, but the extended 8051 models often have a different form factor, and are not "drop-in compatible". all these things are called 8051 because they can all be programmed using 8051 assembly language, and they all share certain features (although the different models all have their own special features).