Ya, Partap ans is:-

Background processes, as the name says, are processes running behind the scene and are meant to perform certain maintenance activities or to deal with abnormal conditions arising in the lifetime of the instance. Not all background processes are mandatory for an instance. Each background process is meant for a specific purpose and its role is well defined. Background processes are visible as separate operating system processes in Unix/Linux. In Windows, these run as separate threads within the same process.

Background processes are invoked automatically when the instance is started. Given below is a list of twenty background processes along with their technical or internally referred names.