The Spring MVC form tags are the configurable and reusable building blocks for a web page. These tags provide JSP, an easy way to develop, read and maintain.

The Spring MVC form tags can be seen as data binding-aware tags that can automatically set data to Java object/bean and also retrieve from it. Here, each tag provides support for the set of attributes of its corresponding HTML tag counterpart, making the tags familiar and easy to use. 

https://www.javatpoint.com/spring-mvc-form-tag-library