Boosting a post and running an ad through Ads Manager both put money behind your content, but they suit different needs. Boosting is the simple option: you take an existing post, choose a budget and a broad audience, and Facebook shows it to more people. It is quick and fine for raising awareness of a popular post or filling an event, but it offers limited control over who sees it and what action you want. Ads Manager is the fuller tool. It lets you choose a specific objective such as messages, leads, or website visits, build a precise audience by location and interest, test different images and headlines, and control where ads appear. That control usually means better value for money once you are clear about your goal. As a rule, boost a post when you simply want more eyes on something that is already doing well, and use Ads Manager when you have a defined goal like generating enquiries and want to spend efficiently. Many businesses start by boosting to learn the basics, then move to Ads Manager as their goals sharpen and budgets grow.