This is the 1576th most frequent German word.
jemals
"Ever" (at any time).
Here 'jemals' is used to ask if at any time in the past or present the subject has experienced something.
Hast du jemals einen so schönen Sonnenuntergang gesehen?
Have you ever seen such a beautiful sunset?
In this case, 'jemals' indicates if there is a possibility within the indefinite future.
Wirst du jemals nach Australien reisen?
Will you ever travel to Australia?
Here, 'jemals' is used hypothetically to discuss a possible situation in a general time frame that might not actually occur.