HTML is the standard markup language used to create and structure content on the web. It defines the structure of web pages using elements such as headings, paragraphs, links, images, and other types of content.
CSS is a stylesheet language used to describe the presentation of a document written in HTML or XML. It controls the layout, colors, fonts, and overall visual appearance of web pages. CSS enables the separation of content (HTML) from design (CSS).
Bootstrap is a popular open-source front-end framework that simplifies web development by providing pre-designed templates and components. It includes HTML, CSS, and JavaScript-based design templates for various forms of navigation.
SQL is a standardized programming language used for managing and manipulating relational databases. It allows you to perform various operations such as querying data, updating records, inserting new data, and deleting data.