Why did european traders begin to travel to asia by sea?

Below are the reasons why European traders begin to travel to Asia by sea:

1. By and large transporting will be modest on the off chance that you take the course by means o the ocean than the land. 
2. before European brokers found the ocean course to Asia, they use to take the land course, which passes through the center east. What's more, when once the ocean courses were found the expenses of many imported products tumbled to 33% of its esteem