The phrase "soft spot" can have multiple meanings depending on its context.
1) In a literal sense, it refers to an area that is tender or sensitive due to being less protected by bone or muscle than other parts of the body. For example, a baby's head has soft spots where the skull plates haven’t fused together yet.
2) Figuratively, "soft spot" can refer to something one cares about deeply or is emotionally attached to. This could be a person, an animal, a cause, etc., that someone feels strongly for and has compassion towards. For example, having a soft spot for animals means you have affection and concern for them.
3) In another context, "soft spot" can refer to a weakness or vulnerability in something. This could be a flaw in an argument, a gap in security measures, etc., that someone may exploit. For example, finding the soft spot in a company's cybersecurity system is a way of hacking into their network.
Overall, "soft spot" can imply tenderness or vulnerability depending on its usage and context.