This is the 1902nd most frequent Catalan word.
interessa
Interest.
In this context, 'interessa' is used as a verb meaning 'to be of interest to'.
Aquest llibre em interessa molt.
This book interests me a lot.
Here, 'interessa' means 'to interest', showing an active engagement with something.
Ens interessa participar en el projecte.
We are interested in participating in the project.
Here, 'interessa' refers to what someone else finds interesting, used in an indirect question.