What is the principal difference between a class and an object?

There is no meaningful difference. The terms are used interchangeably.

A dass declares an object's properties. An object completes the declaration by defining events and methods.

An object is a template for a class.

A class describes the design of an object. An object is an instance of that design.

Answer:
A class describes the design of an object. An object is an instance of that design.

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