This is the 26th most frequent Polish word.
bardzo
"Very."
In this sentence, 'bardzo' intensifies the gratitude expressed by 'dziękuję' (thank you).
Dziękuję bardzo za pomoc.
Thank you very much for the help.
Here, 'bardzo' modifies the adjective 'interesujące' to indicate a high degree of interest.
To jest bardzo interesujące.
This is very interesting.
Here, 'bardzo' is used to emphasize the intensity of liking regarding the activity of watching movies.