Multisite is a feature in WordPress that allows you to create a network of multiple websites or blogs that share a single WordPress installation. This means that you can manage multiple sites from a single dashboard, and share plugins, themes, and other resources between them.
In multisite network subdomain sites usually look like http://blog.yourdomain.com or directories like http://example.com/blog.
When you enable Multisite in WordPress, you can create new sites by adding them to your network. Each site in the network is independent and can have its own domain name, theme, plugins, and settings. You can also set different levels of access for different users, allowing you to control who can manage each site in the network.
However, setting up and managing a Multisite network can be more complex than managing a single WordPress site, and requires some technical knowledge. Additionally, not all WordPress plugins and themes are compatible with Multisite, so you may need to do some research to find compatible resources for your network.