The full form of PARAM is Parallel Machine. It’s used on Computing ,General Computing in India

The rapid penetration of computers into commerce, science, and education owed much to the early standardization on a single machine   model, the von Neumann computer. A von Neumann computer comprises a central processing unit (CPU) connected to a storage unit (memory) (Figure 1.4). The CPU executes a stored program that specifies a sequence of read and write operations on the memory. This simple model has proved remarkably robust. Its persistence over more than forty years has allowed the study of such important topics as algorithms and programming languages to proceed to a large extent independently of developments in computer architecture. Consequently, programmers can be trained in the abstract art of “programming” rather than the craft of “programming machine X” and can design algorithms for an abstract von Neumann machine, confident that these algorithms will execute on most target computers with reasonable efficiency.

Figure 1.4: The von Neumann computer. A central processing unit (CPU) executes a program that performs a sequence of read and write operations on an attached memory.

Our study of parallel programming will be most rewarding if we can identify a parallel machine model that is as general and useful as the von Neumann sequential machine model. This machine model must be both simple and realistic: simple to facilitate understanding and programming, and realistic to ensure that programs developed for the model execute with reasonable efficiency on real computers.