Differences between <c:out> tags and el expression ${}

<c:out> tag differs from El expression ${} <input type= "text" id= "userName" name= "userName"value = "${user.username}"/><input type= "text" id= "userName"name= "userName" Value= "<c:out value=" ${user.username} "/>"/>
1. When the Web. XML was defined as servlet2.3 's head, the second sentence could not be used, only the first sentence, more commonly seen in the old item 2. <c:out> nature is no different, but written as a label for future extensions such as add default, special character conversion, etc.

From for notes (Wiz)

Differences between <c:out> tags and el expression ${}