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.

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Assistance with identifying Minifigures
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The technique of disassembling two or more parts from one another.
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Questions concerning the modification or customization of Lego parts.
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In the LEGO community MOC stands for 'My Own Creation'. Use this tag for questions regarding issues with constructing various features beyond simple structures.
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Any type of components or tools not directly endorsed by LEGO or it's affiliates.
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measured in a variety of ways. How to create or fill a space of a particular size is a common building concern.
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Not sure where you should keep your bricks? If you need to separate them first?
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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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an e-commerce site that allows registered users to buy/sell/auction parts, sets, and other LEGO related items.
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Used for old vintage LEGO sets and pieces.
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Is it more efficient to colour code your LEGO bricks or sort them by shape? What are the best combinations of elements if you've not got enough boxes for each type?
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related to robots - machines capable of carrying out complex operations without human intervention
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Techniques and tips for using special elements.
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made out of ABS (acrylonitrile butadiene styrene)
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a high-level programming language for the Lego Mindstorms NXT.
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A category of powered LEGO products which offer direct and remote control of action bricks via Bluetooth. This system is the successor to Power Functions.
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Circular objects that revolve around axles. This tag typically refers to the wheels used for vehicles.
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Questions about the LEGO product line Bionicles which is a story-based character-focused building theme with science fiction elements.
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provide additional detail to models. Not to be confused with 'decorated bricks' which are bricks that have the details printed directly onto the surface.
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2D & 3D Computer Aided Design (CAD)
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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 way to join LEGO parts permanently, so they can't be separated ever again. Which is as horrible as it sounds.
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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 graphical programming environment that comes bundled with the NXT.
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Questions about the freeware LDraw 3D design program.
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a theme that tailors the iconic LEGO construction experience especially to girls ages five and up.
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Questions regarding the monetary value of LEGO sets/pieces/products.
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Pick-a-Brick at lego.com or retail stores
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Questions related to cars, trucks, planes, ships, motorcycles, and other forms of transport.
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Databases that hold records on LEGO sets. In some cases other products such as clothing and merchandise is also included.
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Questions about sets in a specific theme.
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Questions about the labeling, packaging, and processing of building sets