PgBouncer, an open source connection pooler for Postgres, has been added by Supabase to support developers using Postgres and other popular Javascript frameworks. Connection pooling helps manage connections in serverless environments where middleware servers are not available to maintain a connection. It keeps connections open and idle, ready to accept clients, allowing the database to handle more than it can without a connection pool. Supabase now includes connection pooling for all new projects, with options for different pool modes such as session, transaction, and statement.