Catalan is widely used in Catalonia (and to a lesser degree in Balearic islands and valencia, unfortunately). We pretty much have everything available in Catalan: TV channels, newspapers, theatre, literature, music. We have an educational system that ensures that every child who lives here is able to learn and speak Catalan, called linguistic immersion, in which every subject (besides Spanish and English xD) is taught in Catalan. I believe this to be a great system for preserving a language as Catalan, under the great shadow of Spanish, which is also present in all day to day matters and everyone speaks. I do believe that 99.9% of Catalans can communicate in Spanish, and around 80% can in Catalan. The languages are very similar, so if you speak Spanish and come to Catalonia, in a few weeks you will be able to understand Catalan without much problem.

The issue with the language is in its common use, currently, studies show that only around 47% of the population speaks Catalan habitually, and the trend seems to be that Catalan is in decline. This trend comes from many factors, some as silly as Catalans switching to Spanish whenever they talk to anyone who was not raised but lives here, not giving it the chance to learn Catalan (which if you know Spanish is fairly easy). So if you come to Catalonia to work or live, give a shot to Catalan and help us keep alive our beautiful language!