Explanation

• DOS stands for Disk Operating System.
• It is an early type of computer operating system used to manage files and programs.
• It works through text-based commands (command line).
• A famous example is MS-DOS used in early PCs. 
• Dennis Ritchie is the father of MS-DOS.
• It was developed in 1982.

Last updated by NA on 05-11-2026

Explanation

CAD, or CADD, is short for computer-aided design or computer-aided design and drafting.

CAD is a software used in the computer systems by: 

• Engineers
• Architects
• Drafters
• Artists

Last updated by NA on 04-11-2026

Explanation

• MSE stands for Mean Squared Error
• It measures the average of the squared differences between actual and predicted values.
• It is used as a loss function to evaluate the performance of Artificial Neural Networks (ANNs).
• Lower MSE = smaller prediction errors.

Explanation

• LLM stands for Large Language Model.
• It is an advanced Artificial Intelligence (AI) model trained on large amounts of text data.
• LLMs can understand, generate, summarize, and translate human language.
• They are widely used in chatbots, virtual assistants, and content generation.
• Examples include ChatGPT, Gemini, Claude, and Llama.

Last verified on 21-10-2026

Explanation

• SaaS stand for Software as a Service.
• SaaS is a cloud computing model that allows users to access software over the internet without installing or maintaining it locally.
• Examples include Google Docs, Microsoft 365, and Salesforce.

Additional information:

• SaaS is one of the three major cloud service models: SaaS, PaaS (Platform as a Service), and IaaS (Infrastructure as a Service).

Last verified on 21-10-2026