The document introduces algorithms and pseudocode. An algorithm is defined as a set of rules that must be followed to solve a particular problem. Pseudocode is a written outline of code steps that can be translated into a programming language. Pseudocode is useful to describe how an algorithm should work, explain a computing process simply, and design code collaboratively. Examples of pseudocode are provided to check if a number is even or odd by using the modulo operator and looping through each number.