Effective communication is about more than just exchanging information. It's about understanding the emotion and intentions behind the information. As well as being able to clearly convey a message, you need to also listen in a way that gains the full meaning of what's being said and makes the other person feel heard and understood.
More than just the words you use, effective communication combines a set of 4 skills:
Engaged listening
Nonverbal communication
Managing stress in the moment
Asserting yourself in a respectful way
While these are learned skills, communication is more effective when it becomes spontaneous rather than formulaic. A speech that is read, for example, rarely has the same impact as a speech that's delivered (or appears to be delivered) spontaneously. Of course, it takes time and effort to develop these skills. The more effort and practice you put in, the more instinctive and effective your communication skills will become.