Which technology is used as a visual programming tool to create a program by connecting colored blocks?

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Block-based visual programming lets you build logic by dragging and snapping colored blocks that each represent a programming construct. The color coding helps you quickly identify different kinds of operations and the blocks connect to form a complete program, replacing the need to type code line by line.

Blockly is the technology that provides this exact experience as a reusable library you can embed in web apps. It offers a web-based editor with color-coded blocks for categories like logic, loops, and math, and you connect them to define behavior. The advantage is you can generate real code (JavaScript, Python, etc.) from the block arrangement, making it a versatile tool for teaching and prototyping in IoT and educational contexts.

Other options describe related visual approaches, but Blockly is the classic library built specifically for creating and embedding block-based editors where users connect colored blocks to form programs.