In Google Analytics, a session is a group of user interactions with your website that take place within a given time frame. This time frame is usually set to 30 minutes, which means that if a user is actively engaged with your website for less than 30 minutes without any breaks, their interactions will be considered part of a single session.
Here's an example: Imagine a user visits your website and spends several minutes browsing your homepage, looking at different products, and reading your blog. They then click on a product page and spend a few more minutes reading about a product and looking at the product images. Finally, they add the product to their shopping cart and proceed to the checkout page. In this case, all of the user's interactions with your website (visiting the homepage, browsing the product page, and adding a product to their cart) would be considered part of a single session.
Sessions are important in Google Analytics because they allow you to track how users interact with your website and understand their behavior. For example, you can use session data to see how many users visit your site, how long they stay on it, and which pages they are most interested in. This can help you make informed decisions about improving your website and providing a better user experience.