Can you explain what Flask is and for what purposes it is used in web application development?

Flask is a lightweight web framework in Python used for creating web applications and APIs. Its main features:

• Minimalist and easy to use.
• Allows quick creation of web servers and routes.
• Supports extensions for working with databases, forms, authentication, and more.

Flask is often chosen for small projects, prototypes, or when flexibility in application architecture is needed.

Example of a simple Flask application:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hello, Flask!"

if __name__ == '__main__':
    app.run(debug=True)