The Age of Discovery, also known as the Age of Exploration, was part of the early modern period and overlapped with the Age of Sail. It was a period from approximately the 15th to the 17th century, during which seafarers from European countries explored, colonized, and conquered regions across the globe. The Age of Discovery was a transformative period when previously isolated parts of the world became connected to form the world-system, and laid the groundwork for globalization. The extensive overseas exploration, particularly the opening of maritime routes to the East Indies and European colonization of the Americas by the Spaniards and Portuguese, later joined by the English, French, and Dutch, spurred international global trade. The interconnected global economy of the 21st century has its origins in the expansion of trade networks during this era.