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Considering this, why do gases get compressed?

Gases can be compressed, because they just take up whatever space is available to them. This is because gases consist of molecules that have too little interactions between them to stick together. They just move along until they collide, either with a wall or with each other.

Furthermore, why can gas molecules be easily compressed? Because there is lots of free space between particles, gases can easily be compressed. Because there aren't many particles in a large volume, gases have very low densities typically 1000 times less than in their condensed state as solid or liquid at atmospheric temperature and pressure.

Thereof, can liquid be compressed?

The answer is yes, You can compress water, or almost any material. However, it requires a great deal of pressure to accomplish a little compression. For that reason, liquids and solids are sometimes referred to as being incompressible.

Is Helium a compressed gas?

Non-liquefied gases are also known as compressed, pressurized or permanent gases. These gases do not become liquid when they are compressed at normal temperatures, even at very high pressures. Common examples of these are oxygen, nitrogen, helium and argon.