In computer science, a data structure is a data organization, management, and storage format that enables efficient access and modification, whereas, an algorithm is a finite sequence of well-defined, computer-implementable instructions, typically to solve a class of problems or to perform a computation. Algorithms are always unambiguous and are used as specifications for performing calculations, data processing, automated reasoning, and other tasks.

Good knowledge about the theory of Data Structures and Algorithms can not only help you have more confidence to enter Competitive Programming Contests, or Coding Interviews, but also help you solve many real-world challenges.