Can foreigners get jobs in Korea?

Excuse me, I am a foreign national interested in exploring job opportunities in Korea. Could you please inform me if foreigners are allowed to work in this country? If so, could you provide some insight into the common industries or sectors that foreigners typically find employment in? Are there any specific visa requirements or qualifications that I should be aware of? Additionally, are there any common challenges that foreign workers might face when seeking employment in Korea? Thank you for your time and assistance.