What is the difference between c and C++, OOPS concept, Virtual mechanism, multi threading, How a security product works

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The question covers topics like C vs C++, OOPS concept, virtual mechanism, multi-threading, and security products.

C is a procedural programming language, while C++ is an extension of C with added features like classes and objects.
OOPS (Object-Oriented Programming) is a programming paradigm that focuses on objects and their interactions.
Virtual mechanism allows a derived class to override the implementation of a method defined in the base class.
Multi-threading is the ability of a program to execute multiple threads concurrently.
A security product works by implementing various security measures like encryption, authentication, and access control.

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