Folders Local, LocalLow and roaming: If you use Windows and like to search you've definitely come across them. If you still don't know where they are, it's very easy to find them: 
If you open RUN (Win+R) in Windows 10 and type %AppData% or if you open the File exploration and paste the same in the location bar, you will be taken to a folder called AppData.
This folder exists in the user profile and is created by Windows. There are three others in the folder: Local, LocalLow, and Roaming. Within them you will find folders for the various applications running on your system.
These folders are not the place where your apps are installed, and below we'll see what each one does.
Local, LocalLow, and Roaming envelopes
As already mentioned, these files are created by Windows itself. Even if you do not have applications installed on your system, all three folders are in the AppData folder. In them you will find everything you need for an application that you install to run normally. Chrome, for example, will add a folder Google in Roaming while iTunes will add an Apple folder down to Local. The applications you install decide for themselves where to create their folders, but the "decision" of each application has a purpose.
Location
Let's mention once again that these folders are in the profile of each Windows user. Apps that create folders in Local and store data means they will never give up your system. If you delete the user profile, the applications and data stored in Local will not be deleted.
LocalLow
LocalLow is virtually the same as Local, however, applications that store data in LocalLow because they do not have access rights to store data in Local, or because data is of the kind that should not be stored in Local or Roaming. For example, if you use portable applications, they can create folders here if they do not create them on Local. For example, Adobe stores files in this folder and in the other two folders.
roaming
All folders present in Roaming can be synchronized on a server and can be copied between computers to move a user's profile. Apps that create folders and store files here, like Chrome, do so because they sync their files through some serviceon the web. Chrome stores in the Roaming folder the profile of the user you have created in the browser.
There are applications that create folders in all three, saving different files to each. Adobe is an example, and Microsoft creates and stores some Windows files in each of these folders. If you hurt these files there may be some data loss, for example, you might delete a bookmark from your browser but it will not spoil your system.
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