A tool is a device that most commonly provides a mechanical advantage or ease of working in accomplishing a physical task.
Varieties of tools
- Devices often typify newly invented or specific-purpose tools.
- Instruments are concrete or abstract tools, especially if they are refined.
- Machines can function as ordered systems of tools or as super-tools.
- Hand tools such as pliers, adze, or axe
- Agricultural  tools such as scythe  or sickle
- Power tools http://en.wikipedia.org/wiki/Agriculturalsuch as drill or wood router
- Machine tools such as lathe, milling machine or shaping machine etc., and also with latest technoque of ...........
- Hydraulic tools such as the Hurst tool or hydraulic ram
- Heat-based tools such as soldering iron, welding torch and thermic lance
- Special use tools such as Buggy whip  or whetstone 
- Multitools such as Swiss Army knife or Leatherman
In computing, the term tools can also apply to software programs that assist people doing work on computers, such as Computer Aided Software Engineering tools, Lint programming tool, software or web-based collaborative tools, software development tools, programming tools.
Basic functions of tools
Many tools or groups of tools serve to perform one or more of a set of basic operations, such as:
- Cutting (knife, scythe, sickle, ...)
- Concentrating force (hammer, maul, screwdriver, whip, writing implements, ...)
- Guiding (set square, algorithm, straight edge, tradition, ...)
- Seizing and holding (pliers, glove, wrench, ...)
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