The answer is "the failure to pay back a loan".
In computer systems, we have a different meaning to the word default. It is referred to the setting or option in a computer upon opening a program or application. But according to the dictionary, default refers to the failure to make a payment such as a loan.
Talk about who created it when it was created and the begging of it. Talk about how it established over the years. Then talk about the achivements like the first computer.
