A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Type to find tags:
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General Mindstorms questions and compatibility. If the question refers specifically to the EV3, NXT, or RCX, then use those tags instead.
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A programmable robotics brick released by the LEGO company in late July 2006 and uses Technic connectors. This was preceded by the original RCX brick, and succeeded by the EV3 brick.
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Interested in building techniques? Then this is the tag for you.
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A more advanced form of LEGO®, allowing for the creation of more realistic working parts.
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Questions asking for information about a known LEGO element/brick. Use the [Identification] tag for questions about unknown pieces or sets.
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the current generation of LEGO MINDSTORMS, released in 2013.
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Curious as to what you can do with the elements in a particular set? Want to know what's in a range of sets? What changes have happened with different versions of a set?
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The iconic LEGO® character. They have pose-able heads, arms, hands and legs. Many accessories are available including hair, hats, back-packs, tools and weapons
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Trying to identify a LEGO element or set that you possess or have seen somewhere? Provide as much information as possible and someone's bound to know.
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Questions about programming the various LEGO programmable bricks, including Mindstorms (EV3, NXT, and RCX), Wedo and Scout, in either the provided languages and editors, or more advanced languages.
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The practice of exchanging goods for money or for trade.
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Questions about software related to planning models or programming LEGO robots.
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A popular choice among AFOLs for building their own creations, Trains are now a sub-theme of LEGO City.
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Questions that relate to the history of The LEGO Group and it's products.
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Motors can be used with various Mindstorms and Power Functions sets to add movement.
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A category of powered LEGO products which offer direct and remote control of action bricks.
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Instruction Manuals - use them once to build a model, or store them for future reference? Perhaps you want to create your own? However we can't really field individual manual requests
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Questions about the industrial manufacturing process of brick toys or related materials.
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Questions about the inter-compatibility of different brick sets, or between bricks and some other objects.
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What's the best way to clean your bricks? What's the best way to care for them? These sorts of questions and more should be tagged with this tag.
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Based on the full set of Star Wars films, from episodes I to VI, and the animated Clone Wars film and TV series this was the first licensed theme the LEGO Group produced.
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The original LEGO Mindstorms Programmable Brick. Use this tag if your question specifically relates to Mindstorms Robotics Invention System 1.0, 1.5 or 2.0.
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Questions about the skillful and artistic planning of LEGO structures.
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Any type of components or tools not directly endorsed by LEGO or it's affiliates.
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Questions relating to the LEGO Group specifically, rather than about bricks, building techniques, etc.
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Bricks and Elements sometimes break - perhaps we can help you fix them?
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Not sure what a MOC is? Wondering if you're an AFOL? If someone's mentioned a term and you don't know what it means, ask away!
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Not sure where you should keep your bricks? If you need to separate them first?
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Questions about colour correctness, colour similarities and how to best use certain colours.
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Questions concerning the modification or customization of Lego parts.
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provide additional detail to models.
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designed for young children aged 1½ to 5 years. Duplo bricks are twice the length, height and width of traditional Lego System bricks.
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specifically designed to follow a school's curriculum and are sold almost exclusively to the education sector.
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A proprietary open wireless technology standard for exchanging data over short distances. Used by the NXT for communication between the programmable brick and a PC or Mobile device.
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Separating bricks? Cleaning parts? What should you use to do this without damaging your elements. This can also cover software tools used for cataloguing or designing.
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a graphical programming environment that comes bundled with the NXT.