What is a task runner like Gulp or Grunt used for?

A task runner, such as Gulp or Grunt, is primarily used to automate repetitive development tasks involved in the web development process. These tasks can include processes like minification of CSS and JavaScript files, image optimization, compiling Sass or LESS to CSS, running tests, and live reloading of the project during development. By automating these repetitive processes, developers can save time and reduce the potential for human error, allowing them to focus more on coding and less on manual tasks.

The role of task runners is crucial in improving workflow efficiency by providing a system to define and execute these tasks consistently. They often incorporate plugins that support various automation activities, enhancing the overall development experience.