die Rockband
rock band
A music group that specializes in playing rock music.
Die Rolling Stones sind eine der bekanntesten Rockbands der Welt.
The Rolling Stones are one of the best-known rock bands in the world.

rock band
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rock band
A music group that specializes in playing rock music.
Die Rolling Stones sind eine der bekanntesten Rockbands der Welt.
The Rolling Stones are one of the best-known rock bands in the world.

The word is a clear compound made up of 'Rock' (rock), the music style, and 'Band' (band), a music group. So the meaning is literally a 'music group for rock music'.
Mein Bruder hat mit seinen Freunden eine Rockband gegründet.
My brother started a rock band with his friends.
Common verbs used with 'Rockband' (rock band) are 'in einer Rockband spielen' (to play in a rock band), 'eine Rockband gründen' (to start a rock band), or 'ein Konzert einer Rockband besuchen' (to attend a rock band's concert).
Sie spielt seit fünf Jahren Schlagzeug in einer lokalen Rockband.
She has been playing drums in a local rock band for five years.
When talking about the members, you often use the structure 'Sänger/Gitarrist/etc. einer Rockband sein' (to be the singer/guitarist/etc. of a rock band) or 'Sänger/Gitarrist/etc. von der Rockband [Name]' (singer/guitarist/etc. from the rock band [name]).
Er ist der Gitarrist einer bekannten deutschen Rockband.
He is the guitarist of a well-known German rock band.
band
'die Band' and 'die Rockband' both mean a group of musicians who make music together. 'die Band' is more general and can fit pop, rock, jazz, or other styles. 'die Rockband' is more specific: it mainly plays rock music. The words can be confused because every rock band is also a band. But not every band is a rock band. If the musical style is important, 'Rockband' is more precise.

Die Rockband probt für ihr lautes Konzert am Samstag.
The rock band is rehearsing for its loud concert on Saturday.
Die Band spielt heute Abend auf dem Stadtfest.
The band is playing at the town festival this evening.