A flowchart is a type of diagram that represents a process, system, or computer algorithm. It is a graphical representation of data flow that is useful in writing a program or algorithm and explaining it to others or collaborating with them on it. Flowcharts use symbols, such as rectangles, ovals, diamonds, and arrows, to define the type of step and to connect the steps to define flow and sequence. The process of drawing a flowchart for an algorithm is known as "flowcharting".

Flowcharts are widely used in multiple fields to document, study, plan, improve, and communicate often complex processes in clear, easy-to-understand diagrams. They are still used for programming today, although pseudocode, a combination of words and coding language meant for human reading, is often used to depict deeper levels of detail and get closer to a final product.

Flowcharts can be used to demonstrate the way code is organized, organize big-picture thinking, and provide a guide when it comes time to code. They can also be used to document and analyze a process, standardize a process for efficiency, and troubleshoot issues in the algorithm.

Flowcharts typically use symbols such as terminal, process, decision, document data or input/output, stored data, flow arrow, comment or annotation, predefined process, on-page connector/reference, and off-page connector/reference. The flowchart shows the steps as boxes of various kinds, and their order by connecting the boxes with arrows.

While flowcharts can clearly describe complex source code through graphic representation, some pieces of data flow need remarkable effort to transform into a combination of symbol and shape. However, the flowchart ensures not to have any non-logical path left when programming, and due to the meticulous modification, you will have an ideal condition to design and develop the new system.