B2B (business-to-business) sales is the process of selling to other companies rather than individual consumers (B2C). It typically involves longer sales cycles, multiple stakeholders (a champion, a budget-holder, sometimes a technical evaluator), and a higher average deal size than consumer sales.
B2B sales training usually covers discovery (uncovering the buyer's real problem before pitching), objection handling, and multi-threading — building relationships with more than one contact at a target account so the deal doesn't die if a single champion goes quiet.