Sequelize is an object-relational mapping (ORM) library for Node.js that provides an intuitive, object-oriented way to interact with relational databases, including MySQL, PostgreSQL, and more, using JavaScript.

It abstracts the underlying SQL queries and database interactions, allowing developers to use high-level object-oriented code rather than writing raw SQL queries by hand.

Overall, ORMs simplify and speed up development by reducing the amount of boilerplate code and SQL developers need to write.

However, it's important to note that for complex queries, ORMs may not always be as efficient or flexible as raw SQL.

Installing Sequelize

To install the Sequelize ORM, as well as the MySQL database driver, you can use this npm command:

$ npm install sequelize mysql2

Creating a database connection handler

To create a new database handler for MySQL, you can instantiate the Sequelize class exported by the sequelize module using the following parameters:

const { Sequelize } = require('sequelize');const db = new Sequelize(name, user, password, {  host,  port,  dialect,  logging});