App development can involve various technologies, programming languages, and tools depending on the specific requirements and goals of the application. Here are some of the commonly used technologies and tools in app development:

1. Native app development: This involves developing apps specifically for a particular operating system, such as iOS or Android, using platform-specific programming languages such as Swift or Kotlin.

2. Hybrid app development: This involves using web technologies such as HTML, CSS, and JavaScript to develop cross-platform apps that can run on multiple operating systems. Popular hybrid app development frameworks include React Native, Ionic, and Xamarin.

3. Backend development: This involves building the server-side components of the app that handle data storage, user authentication, and other backend operations. Popular backend development technologies include Node.js, Django, and Ruby on Rails.

4. Cloud services: App developers often use cloud services such as Amazon Web Services, Microsoft Azure, or Google Cloud Platform to host the app's backend, store data, and provide other services.

5. Database technologies: Apps may require databases to store and manage user data. Commonly used database technologies include MySQL, PostgreSQL, and MongoDB.

6. DevOps tools: To streamline the app development process, developers often use DevOps tools such as Git, Jenkins, and Docker to automate tasks such as building, testing, and deploying the app.

Overall, app development can involve a wide range of technologies and tools, and the specific choices will depend on the project's requirements and goals.