A slot is a connection dedicated to one user on a server. For example, a 4 slots server will be able to welcome up to four users at once.
Slot receivers are versatile wideouts who can line up anywhere on the field. They often catch passes behind the line of scrimmage and are capable of running in, out, or up. They are also great blockers who can protect running backs and wideouts by picking up blitzes from linebackers or secondary players.
They must be tough enough to absorb contact in the middle of the field but also fast enough to blow past defenders. They must have good chemistry with quarterbacks to help them gain an advantage in the passing game. They are not usually tall, but they must be strong enough to run through a crowd and beat cornerbacks on crossing patterns.
Many old electromechanical slot machines used a tilt switch to detect tampering, and if the machine was tilted or otherwise tampered with, it would break a circuit and trigger an alarm. Modern machines use microprocessors to weight specific symbols, and a symbol that appears frequently on a reel is more likely to be a winner than a similar symbol that appears rarely.
Slots can have different paylines, and some allow the player to choose which ones they want to bet on. Others have a set number of paylines that cannot be changed and are referred to as fixed slots.