At Lean Labs, we define the job of a B2B website as: to match curiosity with specificity—showing the buyer why they should listen, why they should change, what change they should make, how you're the best vehicle to make that change, how you make that easy and reliable, the outcome you deliver, and backing it all with proof.
An alternative framing: the website's job is to improve the buyer journey and create a buyer-centric experience that feeds sales by generating curiosity and intent, shifting visitors from quasi-curious to possibly serious and willing to understand what's under the hood.
The homepage specifically has one job: get visitors off the homepage and into a highly relevant page where they see a perfect fit. At Lean Labs, we've observed that 70-75% of visitors leave websites from the homepage because they didn't see anything that applied to them, their problem, or their goal. A strategically designed homepage gives a next step to buyers at every stage of the buying process.