B2B marketing is the work of being found, believed and shortlisted by a company that is choosing a vendor. For a consulting firm, a CPA firm, an IT services company, an engineering firm, a staffing agency or a manufacturer, that means a website that explains what you do in the buyer's terms, proof in the form of case studies and credentials, content that shows how your people think, and a way to be found when someone searches for the problem you solve.
Professional services marketing differs from consumer marketing in one important way: the product is expertise, and it cannot be photographed. The buyer is judging whether your team understands their situation. Every piece, from a LinkedIn post to an annual report, either adds to that judgment or takes away from it.
That is why a B2B marketing agency should treat the website, the sales deck, the documents and the campaigns as one system. A strong search ad that lands on a vague services page, or a sharp deck that contradicts the website, costs you credibility at the exact moment a buyer is comparing you with other firms.