Microsoft paint which is serving from the Windows 1.0 version. But now Microsoft is deprecating this in Windows 10. There is no date available which can confirm that when it will be removed but it is in the Microsoft removed or deprecated Fall Creators Update list. It will be available to use in current releases but there will be no more active development on particulate Software. Microsoft also added 3D Builder application as well in the list.
Microsoft paint and 3D Builder feature will be added in new Microsoft software product Paint3D, which already included in Creators Update for Windows 10.
Print3D includes functionality of Microsoft Paint and in addition it can convert 2D object in 3D and can be edited further. It also allows us to share on certain apps like Remix3D and can take print out with 3D printer as well.
Microsoft Paint is the longest survival app of Microsoft. It was around for 32 years in our computers.