We use this option to insert the symbols and equations. The equation is used to insert the common mathematical equations to your document and also we can add equation by using the mathematical symbols. We use Symbols to insert the symbols which are not on the keyboard and, to create the equation, we use the symbols from here. Once an equation is inserted, by clicking on the Equation that was inserted, the Design Tab of the Ribbon will launch.
The Design view for equations allows for much more customization of an Equation, as well as inking and mathematical calculations.