@angular/common provides essential services, pipes, and directives for building Angular applications. It includes functionalities like internationalization (i18n) with number, date, and currency formatting, as well as locale-specific data. Key features are also provided for HTTP communication using HttpClient with interceptors, asynchronous programming with RxJS Observables, and working with platform-specific APIs. @angular/common also offers utilities for rendering components conditionally and iterating over data structures.