ANSWER:

Yes, this is bribe and it’s forbidden. You receive a salary and this money was given to you because of your post. Had you not worked there, no one would have given you anything! 

I work in govt.department and as such for every work to be done in the office everyone wantsbribe.Alhamdullilah i dont.The quest. is if anybody demands money for others work completion then its bribe but if anybody like me does his work and doesnot demands anything from anybody but the opposite himself gives it voluntarily.Will it count to bribe also