Socially and Economically Backward Classes (SEBC). SEBC is another name for all those people who belong to castes that are considered backward by the government. The benefit of job reservation was till then available only to Scheduled Castes and Scheduled Tribes. Now a new third category called SEBC was introduced. Only persons who belong to backward castes were eligible for this quota of 27 per cent jobs. Others could not compete for these jobs.