Social Engineering involves tricking users into performing actions they did not intend to do. This can include manipulation, deception, or impersonation to gain unauthorized access or information.

The "Network" panel in Browser Developer Tools enables the inspection and editing of network requests and responses. It's a crucial tool for debugging and optimizing web applications.

An index in a relational database is a data structure that provides a quick look-up of rows based on column values, improving the speed of data retrieval. It acts as a roadmap to locate specific data efficiently.

Git is commonly used for version control in CI/CD pipelines. It provides a distributed version control system that allows developers to track changes in their codebase efficiently.

The CSS pseudo-elements allow you to style Structural parts of an element. They enable you to style specific parts of an element, such as the first line or first letter.

In a pull request, the Reviewer is responsible for reviewing and providing feedback on the proposed changes. This role ensures the quality and adherence to coding standards before merging.

"Granular recovery" in backup strategies refers to the ability to recover individual items or files rather than restoring the entire system. This approach provides flexibility and efficiency, allowing users to retrieve specific data without the need for a full system restoration.

The Design phase involves designing the architecture of the software system. It is a crucial step where the overall structure and components of the software are planned to meet the specified requirements.

The correct design pattern for ensuring a single instance of a class is the Singleton pattern. This pattern restricts the instantiation of a class to one object and provides a global point of access to that instance. It's commonly used for scenarios like managing database connections to maintain consistency across the application.

Techniques for optimizing frontend performance in SPAs include Code Splitting, which involves breaking the code into smaller chunks and loading only what is necessary for a particular view. This reduces initial loading times and improves the overall user experience.