JavaScript is often associated with the server-side environment in a Node.js application. Node.js enables server-side scripting using JavaScript.

The HTTP 404 status code is used to indicate that the requested resource could not be found on the server. It is a standard response for an unsuccessful request.

In database systems, a lock is a mechanism used to control access to data items by multiple transactions. It helps in preventing conflicts and ensuring the consistency of the data during concurrent access. Locks can be applied at various levels, such as row-level, page-level, or table-level.

Gitflow offers advantages such as Feature Branches for isolated development, a strict workflow for better control, and a well-defined release process, making it suitable for complex projects.

When choosing between MySQL and PostgreSQL, factors like scalability, performance, data integrity, concurrency, community support, licensing, and adherence to transaction isolation and ACID compliance are crucial. The correct option emphasizes scalability and performance considerations.

Angular follows the MVC (Model-View-Controller) architecture for building applications. It separates the application into three interconnected components to enhance modularity and maintainability.

MongoDB stores data in BSON (Binary JSON) format. BSON is a binary representation of JSON-like documents and is the primary data storage format used by MongoDB.

The alt attribute is used to provide alternative text for an image in HTML. This text is displayed if the image file cannot be loaded or if the user is using a screen reader. It is important for accessibility and SEO purposes.

A Clustered Index is a database indexing technique that helps in optimizing query performance by storing data in a sorted order based on the indexed columns. This physical ordering of data on the disk allows for faster retrieval of rows, especially when queries involve range-based searches or sorting. However, it's important to note that a table can have only one clustered index.

The "git branch" command, when used without any additional arguments, lists all existing branches in the Git repository. It's a handy command to see the available branches and the currently active branch.