An icon is a logo for a program
"ico" is a common extension for an icon. An icon is the image you see in a file browser or on your desktop. That icon will represent a file.
An icon.
.ico
first make your icon in paint then save as an ordinary file (.jpg) then use the online tool , favico maker and upload your image. The online tool will make it an icon file then it gives you the option to download it
A widget is a screen graphic or icon. A file widget, also known as a shortcut, is an icon containing a link to a file. Clicking it causes the file to open.
An computer icon is collection of programs or futures that displays in a single file that display as icon
shortcut
Typically, a document or file is opened using an icon that resembles a page or a piece of paper, often depicted with a corner folded down. This icon may also include a pencil or a pen to signify editing capabilities. Additionally, file icons can vary by file type, such as a Word document (DOCX) represented by a blue document icon, or a PDF file shown with a red PDF logo.
The way I always do it is - right-click the icon and left-click properties. In the dialogue box that opens, there is a tab to change the icon. Remember to click Apply - then OK.
If it is an mp3 file (the most common type for downloaded music) you can play it in iTunes or Quicktime - you can drag the song file's icon onto the iTunes icon in the dock to load it. Try double clicking on the song file's icon and see what it opens in.
A file, folder, or program =P
An icon.