HiDPI means “High Dots Per Inch”, which in Spanish would be translated as “High pixel density per inch”. The name under which this technology is marketed varies depending on the manufacturer, with ‘Retina’ being the version that has received the most hype thanks to having a company like Apple behind it.
In short, HiDPI specifies that there is a perfect correlation between the physical pixel of a screen and a virtual pixel. Don’t worry if all of this sounds like Chinese to you because many monitor and computer manufacturers still don’t understand this concept. A little later we will explain what HiDPI consists of with several examples with which you can understand this concept with great clarity.
Source: https://thegoaspotlight.com/2021/12/19/what-is-hidpi-and-why-is-it-key-to-perfect-image-quality/