What does the letter I receive now look like?

The letters I receive now are physical letters and electronic letters.

1. Physical letter: A physical letter refers to a letter sent to the recipient in the form of a paper letter or package. A physical letter contains elements such as an envelope, stationery, and stamps. Write text on the letter paper, sign it, then fold the letter and put it in an envelope, affix a stamp, and finally send it to the recipient's address.

2. Electronic letter: Electronic letter refers to information transmitted by email, text message, instant messaging, etc. Electronic letters do not require envelopes and stamps. You only need to enter text, emoticons and other information on an electronic device, and then send it to the recipient's electronic device.