Data structures and algorithms are fundamental concepts in computer programming used to organize and manipulate data efficiently. 

Data structures are used to store and organize data in a way that makes it easy to access and manipulate. Some commonly used data structures include arrays, linked lists, stacks, queues, and trees. Each data structure has its strengths and weaknesses, and the choice of which one to use depends on the program’s specific requirements. 

Algorithms, however, are step-by-step procedures or instructions for solving a specific problem or accomplishing a specific task. Algorithms use data structures to manipulate data and perform complex computations efficiently. Examples of algorithms include sorting, searching, and pathfinding algorithms. 

The choice of data structure and algorithm can significantly impact the efficiency of software. An efficient algorithm can dramatically reduce the amount of time and resources required to perform a particular task, while an inefficient algorithm can cause a program to run slowly or crash altogether. 

Therefore, understanding data structures and algorithms is crucial for software developers to design and develop efficient and optimized programs. By choosing the appropriate data structure and algorithm for a given task, programmers can improve the performance and efficiency of their software.