<em>A </em><em><u>class</u></em><em> is the blueprint for </em><em><u>objects</u></em><em> having similar attributes.</em>
As much as classifying something means to define it based on the characteristics that is has that are similar to other things in that class, so also is a class here.
A class is the blueprint or rather template for making objects that have similar attributes which means that the class therefore gives the object its various attributes and its behavior.