What is My User Agent

User agent information includes identifiable information such as what device, browser, operating system, software versions etc. that are detected by other device on the internet.

Your user agent information are following:

User Agent: CCBot/2.0 (https://commoncrawl.org/faq/)
Browser Name: Unknown
Browser Version: ?

My User Agent Information or simply User Agent is the information about your browser, screen resolution, Name of Operating System etc. This tools shows you above information so that you can determine that what information is being sent to other websites as user agent.

Websites collect user agent information so that they redirect user with appropriate version of their website. For example if your browser is sending information that you are a mobile phone, website may redirect to mobile version of website if available. Similarly, websites adjust layout according to resolution size of visitor's laptop screen.