Latin (English pronunciation: /ˈlætɪn/; Latin: lingua latīna, IPA: [laˈtiːna]) is an Italic language[3] originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the Ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and many schools and universities continue to teach it.[4] Latin is still used in the process of new word production in modern languages of many different families, including English. Latin and its daughter Romance languages are the only surviving branch of the Italic language family. Other branches of the Italic languages are attested in documents surviving from early Italy, but were assimilated during the Roman Republic.
There you go. That explains everything you need to know about why Latin, even though a dead language, is still relevant today.