Visa requirements for travelers to South Korea vary depending on nationality and the purpose and duration of the visit. Here's a general overview:

1. Visa-Free Entry: Citizens of many countries can enter South Korea for short-term stays (usually up to 90 days) without a visa. This includes nationals of countries such as the United States, Canada, the European Union member states, Australia, New Zealand, and many others. However, the exact duration of visa-free stay and other conditions may vary based on nationality, so it's essential to check with the nearest South Korean embassy or consulate before traveling.

2. Visa on Arrival: South Korea offers visa-free entry or visa-on-arrival to citizens of some countries for short-term stays. For example, travelers from certain Southeast Asian countries may be eligible for visa-free entry or visa-on-arrival for a limited duration. Again, specific requirements and conditions vary, so travelers should check in advance.

3. Tourist Visa (Short-Term Stay): Travelers from countries that do not qualify for visa-free entry or visa-on-arrival must obtain a tourist visa in advance for short-term stays. This typically involves submitting a visa application to the nearest South Korean embassy or consulate and providing required documents such as a passport, visa application form, passport-sized photos, proof of travel itinerary, and proof of sufficient funds for the duration of stay.

4. Other Types of Visas: For those planning to stay in South Korea for purposes such as work, study, or family reunion, different types of visas are available, each with specific requirements and application procedures. These may include work visas, student visas, family visas, and others. Applicants usually need to provide additional documentation to support their visa application, such as employment contracts, acceptance letters from educational institutions, or proof of family relationship.

5. Electronic Travel Authorization (ETA): South Korea has implemented an Electronic Travel Authorization (ETA) system for certain nationalities. Travelers from countries eligible for ETA can obtain travel authorization online before their trip, simplifying the entry process. The ETA allows for multiple entries into South Korea within its validity period.