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web3.js, also known as web3, is a collection of libraries which allow you to interact with a local or remote Ethereum Node, using an Hypertext Transfer Protocol (HTTP) or Inter-Process Communication (IPC) connection. The web3 JavaScript library interacts with the Ethereum blockchain. It can retrieve user accounts, send transactions, interact with smart contracts, and more.

Web3.js API Type:

• eth: Etherum blockchain related methods
• net: Node’s network status
• personal: Account functions and sending
• db: Get/put for local LevelDB
• shh: P2P messaging using Whisper

Source: https://medium.com/coinmonks/web3-js-ethereum-javascript-api-72f7b22e2f0a