A CSS reset is used in HTML to make styles consistent across all browsers. Each browser has its own default ‘user agent’ styles, and these can be different across various browsers. By using a CSS reset, we can overwrite the browser’s default styles to ensure our website or web app appears the same in every browser.
It often includes resetting of margins, padding values, border styles, font sizes, font styles, etc. This reduces browser inconsistencies in things like line height, margin, padding, font sizes of headings, and so much more.
This makes the development process less unpredictable and the layout more stable, while ensuring the user’s browsing experience is consistent. It’s used as a starting point for many projects.