Windows Feature Experience Pack, explained

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What is it?

You can see the Windows Feature Experience Pack listed as one of the Features on Demand for Windows 10 and Windows Server. This list also includes Internet Explorer, Notepad, the DirectX Configuration Database, Paint, PowerShell ISe, Quick Assist, the Print Management Console, and more. The Windows Feature Experience Pack, listed as available on Windows 10 version 2004 and later, "includes features critical to Windows functionality." Microsoft advises users not to remove this collection of Windows client shell components, which is 44.15MB in size.

In its current state

[..] there are a few things in the Windows Experience Feature Pack: The updated Snipping tool; an updated text input panel; and an updated shell-suggestion user interface. I'd expect, over time, that there will be more and more Windows 10 shell components added to the Experience Pack.

Speculation

[..] the Windows 10 Feature Experience Pack fits in with Microsoft's long-term goal of separating the Windows 10 UI/UX from the underlying Windows Core OS. The grand plan was going to be for Microsoft to be able to switch out different shells on top of Core OS, depending on the type of Windows 10 device on which they were running. Is that still the plan?

Read more at What is the Windows 10 Windows Feature Experience Pack? | ZDNet

Windows Feature Experience Pack​

This Feature on Demand package includes features critical to Windows functionality. Do not remove this package.

Feature: Windows Feature Experience Pack

• Capability Name: Windows.Client.ShellComponents~~~~0.0.1.0
• Sample package name: Microsoft-Windows-UserExperience-Desktop-Package~31bf3856ad364e35~amd64~~.cab
• Install size: 44.15MB
• Satellites: No
• Availability: Windows 10, version 2004 and later

Source: Available features on demand