Discuss briefly the different types of mail services offered by the post and telegraph department?

Following mail services are provided by the post and telegraph department:
(a)UPS (Under Postal Service) : Under it the post office provides a certificate of posting on the payment of prescribed fee.
(b)Registered Post: This facility ensures the sender of the mail that in case the mail is not delivered to the adressee, it comes back to the sender.
©Parcel Post : Under this facility, the parcels of specified size and weight can be sent across the country as well as outside the country on the payment of parcel charges.
(d)Speed Post : Under it, the post & telegraph department guarantees that all the internet mail reveived up to 5 p.m. at the specified post offices will be delivered within 24 hours and if it fails to do so, the extra fee changed will be refunded.