Angular and AngularJS, both developed by Google, are prominent frameworks in web development, with each offering distinct features and advantages. Angular, written in TypeScript, is known for its robust, component-based architecture, two-way data binding, and modularity, making it suitable for complex, scalable applications, including mobile development. AngularJS, an earlier version based on JavaScript, follows an MVC architecture and is favored for its simplicity and rapid prototyping, making it ideal for smaller projects. Key differences include Angular's support for server-side rendering and improved performance through features like Ivy rendering and lazy loading. Both frameworks have unique strengths, with Angular offering more modern tools and a stronger ecosystem, while AngularJS provides a more beginner-friendly approach. The choice between them depends on project requirements, existing codebases, and the need for mobile and SEO capabilities, with Angular being more suited for new, complex projects and AngularJS for maintaining existing applications.