Parallel computing have rapidly become a very promising commodity computing solution, expected to play a major role in the design of high performance computing systems for remote sensing missions. Currently, only a few parallel processing strategies are available in this research area, and most of them assume homogeneity in the underlying computing platform. In this paper work, an introduction to parallel computing was given, definition of parallel computing was given, types of parallel computing which bit-level parallelism, instruction level parallelism, task parallelism where listed and explained in details. Also, many more things were talked about in this paper work.