This tag is used to write a String or String returning expression to the Output Stream. In other words, this tag provides a shorthand mechanism of writing strings or String returning expressions to output stream.
<%= statement %>
In this example, we are printing the username using the expression tag. The index.html file gets the username and sends the request to the welcome.jsp file, which displays the username.
<html> <body> <%= "welcome to jsp" %> </body> </html>
<html> <body> <%= "Welcome "+request.getParameter("uname") %> </body> </html>