To be fair, though, reading a dictionary definition of “irony” isn’t much help, as they’re usually kind of wordy and difficult to understand. Or just plain vague. One of Merriam-Webster’s definitions is “the use of words to express something other than and especially the opposite of the literal meaning,” which sounds closer to sarcasm. True, sarcasm would not be possible without the concept of irony, but they are not the same thing.
So, to make things easy for anyone who wishes to utilize the concept of irony successfully, I’m providing this photograph I took of “Go Green!” environmental pamphlets as an example to illustrate it properly:
Ironically, none of the examples in the song “Ironic” are irony. How do you like them apples?