Website Admin Templates are used to create the user interface of the backend in your web application. These templates contain already pre-built pages and components that can be easily integrated with you application for doing regular backend tasks like cleaning the cache or your website, user and content management, installation and configuration of plugins or extensions, tracking network traffic or users that regularly visit your website etc.
Besides, when we talk about admin templates, the Bootstrap framework will always be related to this topic, as its widely known among developers and designers to make almost universally understandable web components. A big part of the templates are built using Bootstrap 2,3 and 4 to provide you with a wide range of possibilities to implement new stuff on your projects.
Material admin template is absolutely free for commercial usage theme.
Admindek is a powerful clean and minimal-looking free admin template.