Which routing protocol is used today?

Could you please elaborate on the routing protocol that is commonly employed in today's digital landscape? As the field of networking continues to evolve, it's crucial to stay informed about the latest advancements and best practices. What factors contribute to the selection of a particular routing protocol, and how does it impact the overall efficiency and performance of a network? Additionally, are there any emerging routing protocols that are gaining traction in the industry, and what are their potential benefits and drawbacks compared to the existing ones?