How email is different from traditional postal service?

u use the comptuer to send out letters, vs hand writting them and place the address of the house and useing s tamp to get it to go where u want it to. also going by snail mail it takes longer as well, and some times it gets bump and it gets returned to the sender. also it takes alot of people to transfer the mail to point A to point B, than just using the computer and the internet.