The tag defines an image in an HTML document. It is a self-closing tag that requires attributes like src (source) to specify the image file path.

Ensuring the security of sensitive customer data involves multiple measures. HTTPS with SSL/TLS secures data in transit, regular software updates patch vulnerabilities, and storing sensitive data encrypted protects it even if there's unauthorized access.

A deadlock occurs when two or more transactions are waiting indefinitely for each other to release locks, leading to a situation where none of the transactions can proceed. Deadlocks must be resolved to allow the system to continue processing transactions.

In Git, a "conflict" occurs when the changes in two branches are Incompatible. This happens when Git can't automatically merge changes due to conflicting modifications in the same lines of code. Resolving conflicts is necessary before completing the merge or rebase.

ACID stands for Atomicity, Consistency, Isolation, and Durability. These properties ensure the reliability and integrity of database transactions. Atomicity ensures that a transaction is treated as a single, indivisible unit of work. Consistency ensures that the database remains in a valid state before and after the transaction. Isolation prevents interference between concurrent transactions, and Durability ensures that the changes made by a committed transaction are permanent.

The term NoSQL refers to non-SQL databases. NoSQL databases are designed to handle unstructured or semi-structured data and provide flexibility in data storage and retrieval.

Resolving a merge conflict in Git requires reconciling the conflicting changes made in different branches. Developers need to edit the files to harmonize the modifications and create a unified version.

To fix a critical bug in production using Gitflow, create a hotfix branch, make the necessary changes, merge it into both master (for the release) and develop (to ensure the fix is in future releases), and then tag the release for tracking purposes.

The status code returned by a RESTful API to indicate a successful request is 200 OK. This status code indicates that the request was successful, and the server has fulfilled the client's request.

When dealing with large volumes of semi-structured data, a NoSQL database is recommended. NoSQL databases can handle flexible schema designs, making them suitable for semi-structured data like JSON or XML.