Unreliable software applications are programs that frequently crash, produce errors, or fail to perform their intended functions. These issues can lead to data loss, decreased productivity, and frustration for users. Common causes of unreliability include poor coding practices, lack of testing, and insufficient updates. Users often encounter unreliable software in various forms, such as mobile apps, desktop applications, and web services. Examples include social media platforms that experience outages or productivity tools that do not save work correctly. Ensuring software reliability typically involves rigorous testing and regular maintenance to address bugs and improve performance.