Answer: The suffix .edu stands for Education.
In the past, all suffixes for websites ended with the .com suffix. The .com suffix was originally supposed to be used for for-profit businesses; however, the a large number of websites started getting developed and was then used as the main TLD(Top Level Domain) for websites.
Other suffixes found today are:
.org = organization
.net = network
.gov = government
Now a days since the internet has become more accessible to most countries, they decided to create different domain suffixes to indicate the language or location of the websites creation and created suffixes like .au, .uk, .ca, etc.