# BYK Introduction

- [Concept and types of overseas direct purchase (overseas direct purchase)](/buyk-whitepaper-eng/byk-introduction/concept-and-types-of-overseas-direct-purchase-overseas-direct-purchase.md): overseas direct purchase
- [Problems of the overseas direct purchase (purchase agency, delivery agency) system](/buyk-whitepaper-eng/byk-introduction/problems-of-the-overseas-direct-purchase-purchase-agency-delivery-agency-system.md): purchase agency, delivery agency system
- [The overseas remittance, currency exchanges cost and time](/buyk-whitepaper-eng/byk-introduction/the-overseas-remittance-currency-exchanges-cost-and-time.md)
- [Problems of the ticketing system](/buyk-whitepaper-eng/byk-introduction/problems-of-the-ticketing-system.md)
- [BYK Vision](/buyk-whitepaper-eng/byk-introduction/byk-vision.md)
