The Agile methodology is generally opposed to the traditional waterfall methodology. It is intended to be more flexible and adapted, and places the customer's needs at the center of the project's priorities. Originally, this approach was created for web and IT development projects. Today, the Agile method is more and more widespread because it is adaptable to many types of projects, all sectors combined. 

A mobile application is a software equipped with a program. After downloading the latter, the file it contains is executed by an operating system. There are different types of mobile applications: native apps , web apps, and hybrid apps . 

The marketplace is now defined as a website on which independent sellers, professionals or individuals, have the possibility of selling their products or services online for the most well-known cases, a commission deducted by the site from each sale. . There are other business models based on fixed fees on sales, subscriptions, insertion fees, price per lead or seller services. 

Developed from 2008, blockchain is primarily a technology for storing and transmitting information. This technology offers high standards of transparency and security because it works without a central control body. More concretely, the blockchain allows its users - connected in a network - to share data without an intermediary. 

In computer science, API is the acronym for Application Programming Interface , which is translated into French as application programming interface or application programming interface . The API is an IT solution that allows applications to communicate with each other and to mutually exchange services or data. Application programming interfaces generally offer a set of functions which facilitate, via a programming language making it possible to launch requests, access to the services of an application.