There is no such word as 'essential' however, there is the word essential. Essential is both an adjective and a noun depending on how it is being used in a sentence. It means absolutely necessary or extremely important.
tha answer is to improve english
The essential elements of a letter include the sender's address, date, recipient's address, salutation, body, closing, and signature. The sender's address and date establish the context, while the recipient's address specifies who the letter is intended for. The salutation opens the communication, the body contains the main message, and the closing and signature provide a formal conclusion. Each element contributes to the letter's clarity and professionalism.