Additional examples are adjusted to the entries in an automated way - we cannot guarantee that they are correct.
So here you go: this is my favorite online Nonogram site, here are a bunch more.
It can be used to solve a particular type of puzzle called a nonogram or logigrams.
Edel エデル (Paint by Numbers, Nonogram, Griddler)
This was a reference to the fact that, when the nonogram was complete, the letters inside the picture (a heart, of course) spelled out: ARTTWOTEN.