Laypeople (Muggles?) are oft led astray by a preconception that "electricity" is a real thing, like bagels or buttercups. It isn't, the way engineers think about it. Electromagnetic phenomena are an inherent property of all matter, and they only discuss measurable aspects of that phenomena, like charge, current, or voltage.
A resistor is a component that is designed to have a specific resistance. Resistance is also a property of all matter, specifically, it is the proportional relationship between the electric field strength (voltage) and the rate of movement of charge (current). These words sound cumbersome because they try to express a mathematical relationship, and all science is really impossible without using math more or less directly.
Resistance is the amount of electric field (voltage) required to push electric charge through a material at a particular rate. Higher resistance means you need more voltage to push the same current; lower resistance means you can push the same current with less voltage, or higher current with the same voltage.
In physical terms, a higher resistance presents more "obstruction" to moving charges, so as they move they crash into things more often. The more often charges crash into an obstruction, the more force (voltage) is required to keep them moving along.
Edit: that video is pretty misleading. At 0:45 it compares electrical current to water (which is not a good analogy) and then proposes that a narrowing of a water tube causes a reduction in flow similar to a resistor, which is not true. The Bernoulli and Navier-Stokes equations govern water flow, and make the water speed up in this situation. Electrical current does not speed up in a resistor.