B2C e-commerce sells online to consumers; B2B sells to companies. They differ more deeply than they look: B2B needs individual price lists, recurring orders, purchase approvals and integrations with the customer's systems.
A B2C store optimises a single impulse: photos, reviews, fast checkout, next-day delivery. A B2B store serves an organisation's buying process: different prices per account, limits and approvals, file-based ordering, deferred payments, ERP integration on the buyer's side.
A common mistake: implementing B2B sales on a purely consumer platform. It works until the first client who wants negotiated pricing and a 30-day invoice.
When we design e-commerce, we start by asking who actually buys and what their process looks like – because B2B and B2C store architectures are two different products, even when they sell the same goods.