Step 1: Format understanding.
An informal letter includes the sender's address, date, greeting, body, and closing.
Step 2: Purpose.
This letter warmly invites the cousin to spend her winter holidays in the native village.
Step 3: Tone.
The tone is friendly, personal, and filled with affection to express excitement and love.

formal Letter Write a letter to the Manager, Youth Club, Pune, requesting him/her to send the details of fees, concession, food and other facilities.
Make enquiry in detail about it.
Add your own points.

Informal Letter Write a letter to your friend informing him/her about this summer camp. Ask him/her to join this summer camp. Tell him/her the usefulness and advantages of this camp.