Определение и Значение "it is not (about) what you know, but who you know"

What is the origin of the proverb "it is not what you know, but who you know" and when to use it?

The origin of the proverb "it is not what you know, but who you know" is unclear, however it has been relevant throughout history, as networking and favoritism have long impacted career advancements and social mobility. While expertise and knowledge remain valuable, this proverb highlights how influential people and connections can sometimes be the deciding factor in one's advancement. It also serves as a reminder to nurture professional and personal relationships, as they may prove to be as important as one's abilities.