Microsoft Certification is separate from Microsoft Imagine Academy. It is the process one goes through to show proficiency with a software program. A Microsoft Certification is an industry standard which is recognized worldwide and which can help open doors to potential job opportunities.
Microsoft Imagine Academy is online coursework designed for anyone who wants to learn how to use Microsoft software products, like Word, Excel and Outlook. There are actually hundreds of online courses available. Many are for more advanced topics too, like Windows Server, SQL Server, and Coding.