operating system

The excellent software which will manage different softwares and provide interaction to the user.this may be different definition but if we watch the OS the whole work done by it is to manage the softwares and provide output. not only softwares it also manage memory for efficient work. and different resources.. when computer reboots first of all processor takes the control and makes runs its files and initializes boot strap loader to run which in turn runs the operating system and makes the other software to work.