pg is a popular PostgreSQL client for Node.js. It offers a pure JavaScript and native libpq binding, providing flexibility and performance. Widely used for connecting to and interacting with PostgreSQL databases, pg supports prepared statements, transactions, connection pooling, and asynchronous queries. Its extensive documentation and community support make it a reliable choice for developers building database-driven applications with Node.js and PostgreSQL. It is an essential component of the Node.js ecosystem for interacting with PostgreSQL relational databases.