Tool

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A tool is an object that helps a person change the world or get a job done. Early tools were simple, solid, hand-held objects with a single broad purpose, unlike machines or computers that can have many functions.

Humans are the most active toolmakers in the animal world, and tool use goes back many thousands of years. Early tools were made from stone, bone, and wood and were used for eating, hunting, making clothes and crafts, and building shelter and infrastructure. Metalworking later created many new kinds of tools, and using energy from animals, wind, or steam allowed people to make even more complex devices. The Industrial Revolution brought widespread automation, so tools could work with less human supervision and greatly boosted productivity.

Tools aren’t just physical. The idea of a tool also includes methods and “toolkits” that help people think, plan, or solve problems.

What counts as a tool has many definitions. In broad terms, a tool is something used to extend our abilities to influence the environment or another object. Some definitions emphasize that a tool is an object that is used to change things, and that the user directly controls it. Others describe tools as items kept for future use or devices that help us do work we couldn’t do with our bodies alone.

Ancient tools and machines
- The earliest known tools come from around 2.5 million years ago, with stone pieces that helped early humans hunt and prepare food. Some of the first distinct tool forms were hand axes.
- In some cases, ancient people also used perishable items as tools, or simple stones that could be used as tools without changing them.
- Early civilizations in Mesopotamia and nearby regions gave rise to several of the classic simple machines: the wheel and axle (first seen with a potter’s wheel), the lever (used in lifting devices), pulleys, and the screw. Water wheels and wind power also played a key role in ancient technology.
- Metal tools and machine tools later revolutionized how parts were made, enabling more precise and interchangeable components. This shift helped power weapons, clocks, scientific instruments, and mass production.

Types of tools
- Tools can be specialized or multi-purpose. Some tools combine several functions in one device (for example, a power drill with attachments). A Swiss Army knife is a famous early example of a multi-tool.
- Sometimes tools can substitute for other tools, either by design (a multi-use tool) or as a makeshift solution (using a screwdriver as a lever when a proper tool isn’t available).
- Protective gear, like gloves or safety glasses, is sometimes debated as a tool, but it fits the broad idea of tools that help us work more safely.

Tool use in animals
- Tool use isn’t just a human thing. Many animals use tools to get food, defend themselves, or explore their world. Primates (like certain monkeys and chimpanzees), elephants, dolphins, sea otters, birds, and even some fish and octopuses have shown tool-using behaviors.
- Some animals create tools themselves, while others use found objects to help with tasks. This shows that the ability to use tools and the idea of tools can develop in many species.

The broader idea of tools
- People also talk about “tools” of reflection, decision-making, or practice—ways to plan, learn, and improve.
- A famous idea is that we shape our tools, and then our tools shape us. Technology can empower us, but it can also influence how we live and think.

In short, tools range from simple stones and levers to intricate machines and mental methods. They’ve helped humans advance from basic survival to building complex societies, and they continue to evolve as new ideas and technologies emerge.