Decision structure - A programming construct that allows a program to choose between different courses of action based on a specified condition. It typically involves using conditional statements such as "if-else" or "switch-case."

Case structure - A programming construct that provides a way to test multiple conditions and execute different code blocks based on which condition is true. It is often used as an alternative to nested if statements.

Loop structure - A programming construct that enables a program to execute instructions repeatedly as long as a certain condition is true. There are several types of loops, including "for" loops, "while" loops, and "do-while" loops.

Sequence structure - A programming construct that represents a series of instructions executed one after another in a predetermined order. It is the simplest type of programming structure and is used in most programs to carry out a set of tasks in a specific order.

The above-given diagram represents the "decision structure".