Users are the visitors who visit your website or mobile app. Sessions are the time they spend on your website or mobile app. Interactions are what the users do while they are on your website or mobile app. For example, think of your website as a restaurant. You’ll have customers (users) who come in once and never come back. You might also have a returning customer (users) who comes to your restaurant multiple times (sessions). For each session, the user will do something like look at the menu, order food, eat their food or pay the bill (interactions). Individual interactions are also called hits. Some users may look at the menu and leave right away because it’s too expensive. Others might spend more time and have more interactions with your website (multiple hits).