A more thorough explanation:

Definition: Obsolete (adjective) means something that is no longer used or out-of-date. Examples:

• The floppy disk is now obsolete.
• The rotary phone is an obsolete technology.
• The typewriter is an obsolete machine.

Explanation: The examples given illustrate the meaning of the word "obsolete" by showing things that were once commonly used but are now outdated and no longer in general use. The floppy disk, rotary phone, and typewriter are all examples of technologies that have been replaced by newer and more advanced technologies.