Microsoft.AspNet.WebApi.Core vs Selenium.WebDriver: What are the differences?

Microsoft.AspNet.WebApi.Core: This package contains the core runtime assemblies for ASP.NET Web API. This package contains the core runtime assemblies for ASP.NET Web API. This package is used by hosts of the ASP.NET Web API runtime. To host a Web API in IIS use the Microsoft.AspNet.WebApi.WebHost package. To host a Web API in your own process use the Microsoft.AspNet.WebApi.SelfHost package; Selenium.WebDriver: Selenium is a set of different software tools each with a different approach to supporting browser automation. Selenium is a set of different software tools each with a different approach to supporting browser automation. These tools are highly flexible, allowing many options for locating and manipulating elements within a browser, and one of its key features is the support for automating multiple browser platforms. This package contains the .NET bindings for the concise and object-based Selenium WebDriver API, which uses native OS-level events to manipulate the browser, bypassing the JavaScript sandbox, and does not require the Selenium Server to automate the browser.

Microsoft.AspNet.WebApi.Core and Selenium.WebDriver can be categorized as "NuGet Packages" tools.

Selenium.WebDriver is an open source tool with 20.6K GitHub stars and 6.27K GitHub forks. Here's a link to Selenium.WebDriver's open source repository on GitHub.