What are the different types of bicycle frame lugs and how do they impact the overall performance and aesthetics of a bicycle?

There are three main types of bicycle frame lugs: investment cast, stamped, and bilaminate. Investment cast lugs are known for their precision and strength, stamped lugs are more affordable but less durable, and bilaminate lugs combine the best of both worlds. The type of lug used can impact the overall performance and aesthetics of a bicycle by affecting its weight, stiffness, and visual appeal.