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.
Questions related to "reentrancy vulnerability" or "reentrant attack", where untrusted code reenters a contract and manipulates state. http://forum.ethereum.org/discussion/1317/reentrant-contracts …
Questions about Ethereum Improvement Proposals (EIPs) which describe standards for the Ethereum platform like protocol specifications, client APIs, contract standards etc.
The purpose of RLP (Recursive Length Prefix) is to encode arbitrarily nested arrays of binary data, and RLP is the main encoding method used to serialize objects in Ethereum.
Question about the Ethereum miner or mining process
Questions about EtherDelta, the decentralized token exchange platform started by Etherboost
Questions related to the optimization of Ethereum aspects such as gas, storage, compilers, etc.
Questions concerned with running Ethereum software on a Raspberry Pi. A small, low cost, single board computer.
Questions related to user anonymity. For questions related to data and smart contract privacy, use [tag:privacy].
Questions regarding Zero Knowledge Succinct Noninteractive Arguments of Knowledge. In particular ZKSNARKs with regard to the elliptic curve precompiles in Ethereum.
Question related to the Ethereum IDEs (Integrated development environment )