is it a compulsion to have a relation to apply for visitor v

[GBDMANN]

is it a compulsion to have a relationship to a person whom we want to apply for a visitor visa or anyone like a family friend can apply?if no relationship is compulsory,wat should bea good reason to apply? like wat should we write in the letter to consulate to issue a visa?
any answers are appreciated

[immihelp]

Re: is it a compulsion to have a relation to apply for visit

It is not compulsory, but it is very difficult to get visa if sponsored by a friend.