An instance is basically an object. In actual english, it can mean differently. In this case instance in english can mean 'To Refer' or 'Reference'. These objects instances in programming are also a reference to the source code. An instance, in object-oriented programming (OOP), is a specific realization of any object. An object may be varied in a number of ways. Each realized variation of that object is an instance. The creation of a realized instance is called instantiation.
Each time a program runs, it is an instance of that program. In languages that create objects from classes, an object is an instantiation of a class. That is, it is a member of a given class that has specified values rather than variables. In a non-programming context, you could think of "dog" as a class and your particular dog as an instance of that class.
The things you need to do for creating the instance of the existing website on your localhost is as follows:
a) Change the database name
b) Enter “root” to the username.
c) Save the changes
8. Now open the browser and open localhost/folder name
These are the steps you need to follow for creating the instance of the website on your localhost.