What is a golden finger?

What is called the golden finger

Memory of the gold finger part is and the motherboard memory slot contact place, in the memory of this place is a neat row of contact points, this part is generally gold-plated treatment, if this part of the pollution or the gold film fall off to produce oxidation, we need to clean up this gold finger part can, as shown in the figure below, This is the memory of the gold finger part. Whether it's 1 generations or 2 generations of 3 generations.

Similarly know the memory of the gold finger is there, then the video card we can understand, as shown in the figure below, the same is the motherboard graphics slot contact Gold-plated processing that part of the card is the gold finger.