From Longman Business Dictionary
specializespe·cial·ize /ˈspeʃəlaɪz/ (also specialise British EnglishBrE) verb [intransitiveI]COMMERCE to limit all or most of your business to a particular activityspecialize inThe firm specializes in small business manangement.
Individuals and regions specialize because productive efficiency is thereby enhanced.
—specialization (also specialisation British EnglishBrE) noun [countableC, uncountableU]Specialization may be a drawback for those who lose their jobs.