A wrapper class is a type of container class, which contains a GROUP of objects as its MEMBERS. It is of an abstract data type. We use a wrapper class for ENCLOSING the collected data. A wrapper class is defined by a programmer, that acts as custom objects, along with wrapper class properties.

The instances of a wrapper class are helpful in displaying various objects in the corresponding table on a Visualforce page.

Some of the main advantages of using wrapper class by developers in Salesforce are given below:

• The wrapper class structure is as efficient as that of a good data visualization process for a web page, especially in the case where the developers are DEALING with the JSON structure.
• The developers are not required to MANAGE the passing of any map structure in order to browse necessary elements. Moreover, usage of wrapper class by developers will lead to ease the process of managing relationships between different objects.
• Wrapper class usage prevents any penalty faced by the users for passing an object of Salesforce. Also, it makes the respective object extendable to constructors of a class.
• The use of the wrapper class supports the developers for efficiently organizing the concerned data, provided the data is properly nested.