Google Analytics starts a new session when someone visits a website and records both the visitor's actions and the session details. Pages per session is the average number of pages viewed during one of those sessions.
The right number depends heavily on the type of site. A blog post that fully answers a reader's question in one page can have a low pages-per-session average and still be doing exactly its job; an e-commerce site where visitors are expected to browse a category, compare a few products, and check a cart usually should see a higher number, and a low one there is more likely a real signal something's off, weak internal linking, unclear next steps, content that doesn't hold interest. Reading pages per session alongside average session duration and bounce rate gives a more complete picture than any one metric alone: multiple weak signals together point more reliably to a real navigation or content problem than a single number in isolation ever could.
