This is a simple translator which converts your text into Wingdings symbols that you can copy and paste. Here's a chart of the Wingding alphabet (click for a larger size):
The reason you can copy and paste the wingdings symbols is because they are "Unicode" symbols. Unicode is a computing industry standard which specifies tens of thousands of symbols so that every browser and new piece of software doesn't have to re-invent a whole new set of symbols and characters. In amongst the 120,000+ characters there is now a full set of all the characters that appeared in the original "Wingdings" font by Microsoft.
If you're interested, there's a bunch more you can do with Unicode symbols. There are some other translators which play with Unicode symbols including a fancy text generator, an emoji translator and a zalgo text generator (t̴̛̜͙̫͇̳̯̤͚͎͎͎̀͐̒͆͑͜͝ĥ̵̛̎̀͑̋͜ị̸̼̮̎̉s̴̨͖͙̗̟̖̯̼̳̐̔̏̀͐̈́͌͋͒̇͗͠ ̴̧̤̗̝̫̲̖̲̗͎͕͓̓̆͋s̵͇̰͋̓̎̂̀̓̈́ţ̸̢̣̤̥̟͙̦̠͎̖̩͍̿̋̄̚ǔ̵̺̋͂͘͝f̷͙͎͓̱͕̣͓̹̂̄̈́͑̅͂̄́͐̽͗̃͂͠͝f̵̠̘̑̓͋̆͊͌̆̍̽̀̓̌̆̃͝).
Wingdings is known as a "dingbat" font because ornamental symbols called dingbats were often used by early printers for asthetic purposes.
You can do the reverse translation too, but please note that the capital letters will not show. That is, when you convert wingdings symbols back to text, it'll always show the text as lower case.