Web app development is the process of creating applications that run on a web browser or web-based platform, rather than as standalone software installed on a computer or mobile device. These web applications are designed to be accessed through a browser and can be accessed from any device with an internet connection.

Web app development involves several different technologies, including HTML, CSS, and JavaScript, as well as frameworks and libraries such as React, Angular, Vue.js, and jQuery. Other technologies that may be used include server-side scripting languages such as PHP, Ruby on Rails, and Python, as well as databases such as MySQL and PostgreSQL.