The B-2 visa is a non-immigrant US visa. This visa gives you permission to enter the US for a short period of time either for tourism to visit the places and for sightseeing, recreation like attending social events, or even for visiting family and friends.
People who already had a US Visit Visa and now applying for renewal can get the visa renewed by booking the visa appointment at the visa application center and submitting the documents in person. Typically the visa is processed within 2-3 days and your passport can be collected from the VAC center or will be couriered to you.