JSTL Import tag is being used in JSP to include the content of other resource in the current JSP.
JSTL Import Tag Example:
<c:import url="http://www.apekshit.com" var="tutorial" />
As you can see above, <c:import> tag imports the content of another resource specified in url attribute to the current JSP. It store the content to variable tutorial and prints it using <c:out> tag in the next line.
The <c:import> tag is similar to import action in JSP. However, <c:import> can import resouces from other applications also by providing absolute path to it.