What is The Main Difference Between Directional Speaker?

https://www.audflyspeaker.com/what-is-the-difference-between-directional-speaker-and-conventional-speaker.html

Conventional speakers are mostly sound-generating devices based on the moving-coil principle, and the directivity of all conventional speakers is fundamentally limited by the size of the source compared to the wavelength it produces. Large-size speakers will be more directional than small speakers, or speakers specified at higher frequencies (smaller wavelengths) will also be more directional. However, acoustic devices based on conventional acoustic theory also have a common feature, that is, the sound emitted is uncontrollable and omnidirectionally propagated to the surrounding space.