* Operating Systems:
* Operating systems are software that manage computer hardware and software resources, providing common services for computer programs.
* Commonly Used Operating Systems:
* Mac OS: Developed by Apple Inc., used on Apple computers.
* Linux: An open-source operating system used on a wide variety of devices from servers to personal computers.
* Microsoft Windows: Developed by Microsoft, it is one of the most widely used operating systems for personal and business computers.
* Not Operating Systems:
* Microsoft Outlook: An email client, part of the Microsoft Office suite.
* MySQL: A relational database management system.
* Mozilla Firefox: A web browser.
References:
* Types of operating systems: Types of Operating Systems
* Mac OS:macOS
* Linux:Linux
* Microsoft Windows:Windows

Google Apps, Dropbox, and GoToMeeting are examples of Software-as-a-Service (SaaS). SaaS provides software applications over the internet as a service. Users can access the software through a web browser without needing to install and maintain the software on their local devices, making it convenient and cost-effective for both individuals and businesses.

The goal of an IT department that directly supports business goals is to develop technological solutions that enable and enhance the company's business operations. Developing an online shopping cart for company products directly supports the business goal of facilitating online sales. This involves:
* E-commerce functionality: Enabling customers to browse, select, and purchase products online.
* User experience: Creating a seamless and user-friendly shopping experience to drive sales.
* Integration: Ensuring the shopping cart integrates with backend systems like inventory and order management.
This development aligns with business goals by enabling revenue generation through online sales.
References
* Efraim Turban, Judy Whiteside, David King, and Jon Outland, "Introduction to Electronic Commerce and Social Commerce," Springer.
* Laudon, K.C. and Traver, C.G., "E-commerce 2020-2021: Business, Technology, Society," Pearson.

Data is considered information when it has been processed and organized in a meaningful way. Raw data in its unprocessed state is not useful until it undergoes processing to become interpretable and actionable information. Processing can involve sorting, aggregating, and analyzing data to extract valuable insights.

A system requirement that involves preventing unauthorized access to data is aSecurityrequirement. Security requirements ensure that the system:
* Protects data integrity: Ensuring data is accurate and unchanged by unauthorized users.
* Maintains confidentiality: Preventing unauthorized access to sensitive information.
* Ensures availability: Making sure that data and resources are available to authorized users when needed.
Security requirements are critical for safeguarding the system against threats and vulnerabilities.
References
* Dieter Gollmann, "Computer Security," Wiley.
* Ross Anderson, "Security Engineering: A Guide to Building Dependable Distributed Systems," Wiley.