In what cases are selectors used in programming or interface development?

Selectors are used in programming and interface development to select and manipulate specific elements or objects based on their properties.

In different contexts, it looks like this:

• CSS selectors in web development allow selecting HTML elements by tag, class, ID, attributes, etc., to apply styles or event handlers.
• Selectors in JavaScript (e.g., document.querySelector) are used to access DOM elements.
• In UI frameworks (React, Angular, Vue), selectors can be used for data binding or component state management.
• In programming languages, selectors can mean constructs for selecting data, for example, in SQL — selecting columns, in functional languages — pattern matching.

Example of using a CSS selector:

.button-primary {
  background-color: blue;
  color: white;
}

This selector selects all elements with the class button-primary and applies styles to them.