? USER AGENT STRING EXPLANATION ?

[Father]

Example User-Agent:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36

Mozilla
MozillaProductSlice. Claims to be a Mozilla based user agent, which is only true for Gecko browsers like Firefox and Netscape. For all other user agents it means 'Mozilla-compatible'. In modern browsers, this is only used for historical reasons. It has no real meaning anymore

5.0
Version

Windows NT 10.0
Operating System: Windows 10

Win64
Win32 for 64-Bit-Windows. API implemented on 64-bit platforms of the Windows architecture - currently AMD64 and IA64

x64
64-bit Windows version

AppleWebKit
The Web Kit provides a set of core classes to display web content in windows

537.36
Web Kit build

KHTML
Open Source HTML layout engine developed by the KDE project

Chrome
Chrome Browser

91.0.4472.77
Chrome version

Safari
Based on Safari

537.36
Safari build

Description
Free open-source web browser developed by Google. Chromium is the name of the open source project behind Google Chrome, released under the BSD license.

Source: http://useragentstring.com/index.php