Regards and Thanks are two valedictions that are considered as informal closings. ‘Regards’ is used when sending someone best wishes or something along those lines. ‘Thanks’ is often used when asking for a...

‘Yours faithfully’ is a term is used in a formal letter where the recipient is not acknowledged by name. ‘Best regards’ is a term that is often used for informal letters that are written to friends or close...

‘Yours sincerely’ is commonly used in a formal letter wherein the author knows the name of the respondent. ‘Regards’ is commonly used for informal communication that is written to close friends or relatives.