Facial expressions are a primary form of communication

Humans have invented spoken language, and they are very proud of it.
They talk so much that they've ended up neglecting more fundamental methods of communication such as; touching, gestures, eye contact, and facial expressions.
These fundamental forms of expression can convey more information, faster than speech, but they can also express messages that cannot be communicated through language.

Even if no one can see, the fetus is continuously conveying its emotions through facial expressions and gestures.
Adults do the same, and their face is set into motion just by thinking about something, even if no one is around.

During their evolution, primates abandoned olfactory signals in favor of visual ones; therefore, they rely heavily on their faces to communicate.
They have developed their facial muscles more than any other type of animal.
These muscles are directly controlled by the nervous system and express emotions.
This is why facial expressions represent the most natural form of communication.

Facial expressions are also cross-culturally understood.
Several species have hairless regions, eyebrows or colors to improve intelligibility.
Humans are apes, and they are experts at making faces.

Facial expressions are produced almost instantaneously.
In fact, they appear faster than your brain can react, and can express emotions you might later want to hide.
The person relating with you knows how you feel faster than with any other form of communication.
Just one split-second glance can give you a good idea of a person's emotional state.
Often, words wouldn't even do justice to the complexity and strength of the feelings you can express with your face.

Since you don't control the initial moments of your reaction to events, you may be dissatisfied with the facial expressions you put out.
They reflect your true feelings; but what you really think about something might be offensive to the person in front of you.
You then quickly alter your expression when your conscious mind takes over.
We can speak of:
• Involuntary expressions; Occurring immediately after the stimulus.
• Voluntary expressions; Afterwards.

As soon as you voluntarily display a facial expression, it sticks with you.
The link in your brain between emotions and expressions is so strong that it can work in reverse..
You can observe that simply displaying an expression on your face will evoke the associated emotion within you.
You can use this phenomenon constructively by displaying positive expressions.
This also works with others, and you'll find out that by presenting a smiling face, you receive many smiles in return.

I'm a very sociable person who meets hundreds of strangers every day.
I generally don't have to speak to these people to relate with them.
I use eye contact, facial expressions, gestures and postures.
I find that I can express myself better, and more quickly, in this way.
I consider facial expressions to be a complex and complete language.
However, most humans are social and communication peewees; therefore, they struggle to express themselves in this way, except with their family and friends.