Angular Interview Test 2025 – 400 Free Practice Questions to Pass the Exam

The primary purpose of pipes in Angular is to format and transform data for display in templates. Pipes are built-in or custom functionalities that allow you to manipulate and display data in a more user-friendly way. For instance, you can use pipes to format dates, currency, or percentages directly within your HTML templates by appending a pipe operator followed by the pipe name.

When you use a pipe, the original data remains unchanged, and the transformed data is what gets rendered in the view. This makes pipelines an efficient way to display various forms of transformed data without altering the underlying data model. Additionally, pipes can be pure or impure, where pure pipes only change when their input data changes, helping to optimize performance in applications.

The other choices address different functionalities within Angular. Handling events triggered by user interactions relates to event binding and directives that manage user input, while managing application routes refers to the Angular Router's handling of navigation and view rendering. Interfacing with database services pertains to handling API calls and managing data retrieval or storage, typically using services in Angular.