The JSTL <c:remove> tag is used to remove a variable or attribute from one of the JSP scopes, such as the request or session scope. This tag is useful for cleaning up variables or attributes that are no longer needed, or for removing variables or attributes that could cause naming conflicts with other variables or attributes.

The basic syntax for the <c:remove> tag is as follows:

<c:remove var="variableName" scope="scopeName" />

The var attribute is used to specify the name of the variable or attribute to be removed, while the scope attribute is used to specify the scope in which the variable or attribute is stored. The scope attribute is optional, and if it is not specified, the variable or attribute will be removed from the page scope.

Here's an example that shows how to use the <c:remove> tag to remove a variable from the request scope:

<c:remove var="myVariable" scope="request" />

In this example, the myVariable variable will be removed from the request scope.

Note that the <c:remove> tag should be used sparingly, as removing variables or attributes can make your code harder to read and maintain. In general, it is better to simply set variables or attributes to null or an appropriate default value when they are no longer needed, rather than removing them from the scope entirely.