The Iterator design pattern is used to provide a way to access elements of an aggregate object sequentially without exposing its underlying representation. It abstracts the traversal mechanism and allows the client to access elements without knowing the internal structure.

The Observer pattern is appropriate for scenarios where multiple modules need to be notified of changes in another object. It establishes a one-to-many dependency between objects, ensuring that when one object changes state, all its dependents are notified and updated automatically.

Multi-Version Concurrency Control (MVCC) works by creating a new version of a modified data item for each transaction. This allows multiple transactions to access different versions of the same data concurrently, promoting better concurrency and reducing contention for resources.

One way to reduce the frequency of merge conflicts in Git is by regularly rebasing branches with the main development branch. Rebasing incorporates the changes from one branch into another, maintaining a cleaner and linear project history.

Gitflow and GitHub Flow differ in their branching models. Gitflow tends to be more complex, with designated branches for features, releases, and hotfixes. GitHub Flow, on the other hand, is simpler, focusing on branches for features and releases in a more continuous delivery style.

CSS preprocessors such as SASS and LESS are widely used in the industry to enhance and streamline responsive design workflows. They offer features like variables, mixins, and nesting that facilitate more efficient and maintainable stylesheets.

SQL stands for Structured Query Language. It is a domain-specific language used to manage and manipulate relational databases.

Minifying JavaScript and CSS files involves the process of removing unnecessary characters such as white spaces and comments. This reduces the file size, leading to faster load times for web pages.

The 'Elements' tab in Browser Developer Tools is used to inspect and manipulate HTML and CSS. It provides a visual representation of the document's structure, allowing developers to view and modify the HTML and CSS code.

The command "git log --graph" displays a text-based representation of the commit history with a graphical structure. It helps visualize the branching and merging of commits in a more readable format.

Using responsive images with the srcset attribute allows the browser to select the most appropriate image based on the user's device, improving performance. It tailors the image delivery to the user's screen size and resolution.

The SQL keyword used to retrieve data from a database table is SELECT. It is a fundamental and commonly used keyword in SQL for querying and retrieving data.