Google Analytics is part of Google's larger marketing platform, and it is often a go-to for web marketing analysis. Your interviewer is interested primarily in how you use a tool like Google Analytics and what you use it for. So, if you don't have a lot of experience using it, then do some research on what it does and what it offers, and draw comparisons to a tool that you have used. When answering this question, you primarily want to demonstrate that you are experienced and equipped in data collection, analysis, and report distribution using web-based platforms.