Gain insights into developing web applications using Flask, a lightweight and easy-to-learn Python framework. Delve into techniques that make you a sought-after full-stack developer.

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This project-based course is a detailed guide to web application development using the increasingly popular Flask framework.

Flask is known for being simple, lightweight and having a small learning curve. If you've got some experience in Python, picking up Flask will be a breeze. It's got a booming job market and will put you on track to becoming an in-demand full-stack developer. What's not to love?

Flask: Develop Web Applications in Python

## Introduction

You might have heard comments such as *“Flask is 100% WSGI compliant”* or, *“Flask uses Jinja as a template language.”* But *what exactly does this mean?* What are **WSGI** and **Jinja2**? Let’s learn what these terms mean and their significance concerning Flask!


## Web Server Gateway Interface (WSGI)


The **Web Server Gateway Interface**, or more commonly known as **WSGI**, is a standard that describes the specifications concerning the *communication between a web server and a client application*. The detail of these specifications is present in [PEP333](https://www.python.org/dev/peps/pep-3333/). Here are some benefits of **WSGI**:

- **Flexibility** with the components of the application.
- **Interoperability** within different Python frameworks.

- **Scalability** of the application with an increase in users.
- **Efficiency** in terms of speed of development.

We do not need to concern ourselves with the internal details of WSGI or how it is implemented because this aspect of the application is handled by the `Flask` module. 

## The Jinja template language

**Jinja** is a template language used in Python. But, you might ask, *what exactly is a template language?* 


First, let’s recall what templates are. We said that the templates are the front-end, which the user sees. In the case of a website, the templates are the `HTML` pages. A template language is one that we can use inside `HTML` so that the content on the `HTML` page becomes dynamic.

# Introduction

You might have heard comments such as *“Flask is 100% WSGI compliant”* or, *“Flask uses Jinja as a template language.”* But *what exactly does this mean?* What are **WSGI** and **Jinja2**? Let’s learn what these terms mean and their significance concerning Flask!


# Web Server Gateway Interface (WSGI)


The **Web Server Gateway Interface**, or more commonly known as **WSGI**, is a standard that describes the specifications concerning the *communication between a web server and a client application*. The detail of these specifications is present in [PEP333](https://www.python.org/dev/peps/pep-3333/). Here are some benefits of **WSGI**:

- **Flexibility** with the components of the application.
- **Interoperability** within different Python frameworks.

- **Scalability** of the application with an increase in users.
- **Efficiency** in terms of speed of development.

We do not need to concern ourselves with the internal details of WSGI or how it is implemented because this aspect of the application is handled by the `Flask` module. 

# The Jinja template language

**Jinja** is a template language used in Python. But, you might ask, *what exactly is a template language?* 


First, let’s recall what templates are. We said that the templates are the front-end, which the user sees. In the case of a website, the templates are the `HTML` pages. A template language is one that we can use inside `HTML` so that the content on the `HTML` page becomes dynamic.

In this lesson, we will learn about WSGI and Jinja, and what their purpose is in Flask.

Before Getting Started

Introduction to Flask

First Flask Application

Build File/Directory Explorer in Flask

Static Templates

Static Files

Dynamic Templates

Form Handling

Database

Operations on Models

Conclusion

Test a MEAN Stack Todo Application with JEST

Build an E-Learning Website Using Flask

WSGI and Jinja2

Introduction

Web Server Gateway