The B1 visa and B2 visa are temporary, non-immigrant, multiple-entry visas that allow the holder to travel to the United States for either business or tourism purposes.
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The short answer is no, you cannot apply for a B-1/B-2 visa on behalf of someone else. The visa application process is a personal one, and the applicant must attend the interview in person. However, as a U.S. citizen or green card holder, you can support your family member or friend who is applying for the visa.
An invitation letter is not mandatory. In fact, you can submit the form without a letter. But it can smooth the entire process. Obtaining a U.S. visa is challenging, with the USCIS adopting strict measures and the high number of applicants.