gewaltig
huge
Of very great size, strength, or intensity; enormous or impressive.
Der Elefant hinterließ gewaltige Spuren im weichen Boden.
The elephant left huge tracks in the soft ground.

huge / tremendous
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huge
Of very great size, strength, or intensity; enormous or impressive.
Der Elefant hinterließ gewaltige Spuren im weichen Boden.
The elephant left huge tracks in the soft ground.

The word 'gewaltig' (huge/tremendous) is derived from the noun 'die Gewalt' in the sense of 'power' or 'force'. So it describes something that has the size or effect of a great force, and does not mean 'violent'.
Der Sturm hatte eine gewaltige Kraft.
The storm had tremendous force.
'Gewaltig' (tremendously) can be used like an adverb to intensify a verb or another adjective. In this function, it means colloquially 'very' or 'enormously'.
Du hast dich seit unserem letzten Treffen gewaltig verändert.
You've changed tremendously since our last meeting.
As an adjective, 'gewaltig' (huge) often describes things of great scale. Common combinations are 'ein gewaltiger Unterschied' (a huge difference), 'ein gewaltiger Druck' (tremendous pressure), or 'eine gewaltige Aufgabe' (a huge task).
Zwischen den beiden Meinungen gibt es einen gewaltigen Unterschied.
There is a huge difference between the two opinions.
very
'sehr' and 'gewaltig' can both express strong intensity. 'sehr' is general and neutral. 'gewaltig' sounds stronger and often more impressive. It fits especially when something is large, strong, or clearly noticeable, for example 'ein gewaltiger Unterschied' (a huge difference) or 'gewaltig viel Arbeit' (a tremendous amount of work). As an intensifier, 'gewaltig' is not as general as 'sehr'. You use it more when you want to show that something seems really large or intense.

Wegen der Prüfung lernt sie gewaltig viel.
Because of the exam, she is studying a tremendous amount.
Wir unterstützen das Projekt heute sehr gern.
We are very happy to support the project today.