It can be used in a variety of contexts, such as:
* "Ik ben gelukkig." (I am happy.)
* "Gelukkig nieuwjaar!" (Happy New Year!)
* "Het was een geluksdag." (It was a lucky day.)
The word "gelukkig" can also be used as an adjective, meaning happy or fortunate.
For example, "Een gelukkig gezin." (A happy family.)