You are immediately disconnected, and any endorsements or recommendations from that person are removed.
However, the block feature is also used for "social landscaping." This involves removing individuals who are politically volatile, consistently unprofessional, or simply toxic influences on one’s feed. While the "Unfollow" feature allows a user to silence a connection without severing ties, "Block" is the nuclear option. It is typically reserved for situations where a user wishes to ensure the other party cannot view their profile—perhaps to prevent a competitor from monitoring their movements or to hide job-hunting activities from a current employer.
Before we dive into the how-to, let's quickly cover why you might want to block someone on LinkedIn: