[Manal]

As far as I understand it, and to put it in simple words:

Spots in space aren’t necessarily empty. They tend to contain some type of energy (can exist in several forms). This energy can sometimes change in different spots of empty space, this is referred to as quantum fluctuations (hence the word fluctuations). However, this is NOT a permanent change in energy. This is because it returns back to its original state.

Hope I made things as clear and simple as possible.

The above statement is false.

Space isn't vacuumed FYI and even the most vacuum thing would have at least 2-3 atoms present in it hence the vacuum isn't actually vacuumed. However, Quantum Fluctuation is different as it fuses up with virtual particles and particles at the 3d level, creating energy. This, however, violates law of conservation of energy. That is why this phenomenon is given the name "Quantum Fluctuation". The "quantum realm" doesn't follow up the physical law of our space and hence any object/energy/phenomenon taking place at the smallest level(Planck's constant) is called "Quantum mechanics".