Optimizing the performance of a RESTful API involves various strategies. Implementing caching mechanisms can significantly improve response times by serving cached data for frequently requested resources, reducing the load on the server.

Content Security Policy (CSP) is used to mitigate Cross-Site Scripting (XSS) attacks by controlling which resources are allowed to be loaded on a web page. It helps prevent unauthorized script execution, enhancing the overall security of web applications.

"ETL" stands for Extract, Transform, Load in data migration. It is a process that involves extracting data from source systems, transforming it into a suitable format, and loading it into a target system for analysis or storage.

Continuous Deployment refers to the automatic release of changes to the production environment. It involves automatically deploying code changes to the live environment after passing all necessary tests.

The primary difference is that SQL databases are relational and have a structured schema, while NoSQL databases are non-relational and use a flexible schema, allowing for easier scalability and handling of unstructured data.

The main concept behind Object-Oriented Programming (OOP) is Abstraction. Abstraction involves simplifying complex systems by modeling classes based on real-world entities and focusing on the essential properties and behaviors.

Automation allows developers to automate repetitive tasks, enhancing productivity and maintaining consistency in code formatting, testing, and deployment processes. It is a key aspect of modern software development practices.

In Python, the raise keyword is used to raise an exception manually. It allows the programmer to indicate that a particular exception has occurred.

The CSS box-sizing property determines how the width and height of an element are calculated. It includes options like content-box and border-box that affect how the total size is computed.

Git is a widely used platform for version control and collaboration in software development. It allows developers to track changes, collaborate with others, and manage code repositories efficiently. Git's decentralized nature and branching capabilities make it a popular choice in the development community.

Concatenation is a common technique for improving website loading speed. It involves combining multiple files, such as CSS or JavaScript, into a single file, reducing the number of HTTP requests required to load a page. This optimization technique helps minimize load times by reducing latency.

A stack follows the Last In, First Out (LIFO) principle. In a stack, the last element added is the first one to be removed. It is commonly used for managing function calls, expression evaluation, and undo mechanisms.