Flask is a popular Python framework for building small to medium-sized applications. Its customizable nature makes it an excellent choice for developers. It has also gained popularity in the Data Science community, allowing Data Scientists to create and deploy APIs quickly for models in production. With Flask, developers can also render front-end templates using Jinja2. Flask is handy for building microservice-based architectures, where self-contained services can be easily integrated into larger applications. Significant applications like Netflix and Uber use Flask as their backend. This blog provides a step-by-step guide on bootstrapping a Flask application, installing Flask, and building a sample project with GET, POST, PUT, and DELETE methods.