Input file type is used to create file button and button is used to take file location from your desktop.
<input type=file
/>
You can use file in forms and any where within an HTML document.
Input is unpair tag and output of file is file button like you can see in above example.
Open notepad or any other text editor, follow the following points.
Submit File
save file with name task.html or task.htm and then open it using any browser and see results.
Don't forget input is empty element which means it always comes in single not in pair.