Apps are generally developed using a variety of technologies, such as Java, HTML5, Objective-C, C++, and Swift. Java is the most commonly used, as it is a widely accepted programming language. HTML5 is also used to create mobile apps, as it offers an array of features that make the apps look great on all platforms and devices. Objective-C and C++ are used to develop apps for Apple devices, as they are optimized for iOS. Swift is the newest Apple language and is quickly becoming the most popular choice for app development. All of these technologies have their advantages and disadvantages, so it is important to weigh the pros and cons before making a decision. For example, Java is easier to learn and more widely accepted, while Swift is more powerful but not as widely adopted. Ultimately, the best technology for any given app will depend on the specific requirements of the project.