ständig
constant
Continuing without interruption or repeating at short intervals; continuous or very frequent.
Der ständige Lärm von der Straße macht mich nervös.
The constant noise from the street makes me nervous.

constant
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constant
Continuing without interruption or repeating at short intervals; continuous or very frequent.
Der ständige Lärm von der Straße macht mich nervös.
The constant noise from the street makes me nervous.

The word 'ständig' (constant/constantly) is derived from the verb 'stehen' (to stand). The basic idea is that something 'stehen bleibt' (stays in place) and does not change, so it is permanent or ongoing.
Wir stehen in ständigem Kontakt.
We are in constant contact.
'Ständig' (constant/constantly) can stand as an adjective before a noun or as an adverb describing a verb. The form of the word does not change in this use.
Der ständige Regen ist deprimierend.
The constant rain is depressing.
Although 'ständig' (constant/constantly) can be neutral, it is very often used to express annoyance or frustration about something that repeats frequently and is disturbing.
Mein Nachbar hört ständig laute Musik.
My neighbor is constantly listening to loud music.
always
'immer' and 'ständig' can both say that something happens very often or without a break. 'immer' is more neutral and often means 'every time' or 'at all times'. 'ständig' puts stronger emphasis on something happening constantly or coming back at short intervals; it often sounds a bit annoyed or intense. They can be confused when talking about frequent actions. As a simple guide: 'immer' works well for fixed habits, while 'ständig' works well when something happens noticeably often or almost too often.

Nach dem Training hat sie ständig über Schmerzen im Knie geklagt.
After training, she kept complaining about pain in her knee.
Auf Reisen nehme ich immer eine kleine Wasserflasche mit.
When I travel, I always take a small water bottle with me.