This is the 480th most frequent Hebrew word.
בהרבה
"בהרבה" means "in many" or "by much."
In this context, 'בהרבה' emphasizes the degree of interest being greater.
הספר הזה יותר מעניין בהרבה מהקודם.
This book is much more interesting than the previous one.
The usage of 'בהרבה' here quantifies and describes the frequency of occurrences.
בהרבה מקרים אנשים שוכחים דברים חשובים.
In many cases, people forget important things.
Here, 'בהרבה' is used to indicate a significant improvement or advancement.