A slot is a narrow opening, usually in a machine, into which you can drop coins. A slot can also mean a position or time that can be reserved for an activity.
Modern slot machines are electronic, but the basic principle is the same. You insert money or, in ticket-in, ticket-out machines, a paper ticket with a barcode. Then you activate the machine by pushing a lever or button (physical or on a touchscreen). The reels spin and when they stop, if they have matching symbols, you win credits according to the paytable. Each machine has a theme, which influences the symbols and other bonus features.
The best online slots are graphically stunning and have great animations. They are also often based on popular music or movies. For example, Motorhead is a great heavy metal slot game from NetEnt, while Guns N Roses and other rock-themed games are also popular.
Although a slot can feel like it loosens up after a long time, this isn’t true. In fact, the machine’s program does not change with time. All spins are random and the odds of hitting a jackpot remain the same at all times.