What is flowchart?

A flowchart is a visual diagram that shows the steps of a process or system using simple shapes like arrows, rectangles, diamonds, and ovals. Each shape represents a specific type of action (e.g., start, decision, operation) and the arrows show the order in which those actions happen.

Let's break it down

  • Oval - marks the start and end points of the flowchart.
  • Rectangle - shows a regular step or instruction (e.g., “Add two numbers”).
  • Diamond - indicates a decision that can go in two or more directions (e.g., “Is the number > 10?”).
  • Parallelogram - used for input or output actions (e.g., “Enter name”).
  • Arrows - connect the shapes and guide the viewer through the sequence.

Why does it matter?

Flowcharts turn complex, text‑heavy instructions into a picture that’s easy to read. This helps people understand how something works, spot mistakes, and communicate ideas quickly across teams, even if they have different technical backgrounds.

Where is it used?

  • Writing computer algorithms and pseudocode.
  • Designing software or app workflows.
  • Documenting business processes like order handling or customer support.
  • Teaching concepts in schools and training programs.
  • Planning projects, troubleshooting hardware, or mapping out network setups.

Good things about it

  • Simple and quick to create with pen‑paper or free online tools.
  • Makes it easy to see the big picture and the details at the same time.
  • Helps catch logical errors early before any code is written.
  • Universally understood; no need for advanced technical jargon.
  • Useful for collaboration, as anyone can add or edit a shape.

Not-so-good things

  • Can become messy and hard to read if the process is very large or complex.
  • Limited in showing detailed data or calculations; it’s more about flow than specifics.
  • Different people may use slightly different symbols, causing confusion.
  • Not ideal for representing parallel or highly asynchronous processes without extra notation.
  • Over‑reliance on flowcharts may discourage learning the underlying code or logic.