Culture and UICulture
In many cases, if the browser doesn’t provide a language then the language can’t be matched to one of the .NET installed cultures. .Net Culture drives things like number and date formats, sort order, currency symbol, casing, it is primarily geared towards formatting and converting things. If we talk about UICulture in ASP.NET then ‘resx’ resources or a custom ResourceManager or ResourceProvider that is selected by UICulture for display.
Mapping of cultures via the CultureInfo class which is provided by the .Net framework. CultuterInfo class, culture, and UICulture properties that determine the current cultural context for the running code. If we talk about current culture, then it determines how things are formatted which is important for number and date conversions. There is a very important feature of .Net, by which you can switch cultures on the fly by assigning a new culture.