Each and every planet in the Solar System moves in a direct manner, they never retrograde, nor do they remain stationary, each one has different speeds due to its orbital position. Mercury moves around the Sun faster than Earth, therefore it apparently seems to pass us. Something similar also happens with the other planets when their orbit coincides in certain places and at determined moments.
For Astrology this movement, which can repeat 3 times throughout the year, has a specific meaning, it means that it is "retrograde." Mercury is the one that points to everything related to communication, communication in all its extent, the written word, that which involves travel or any system of communication.
Since this period occurs every year, many people are born with retrograde Mercury, it is not something rare. Retrograde Mercury in a natal chart tells us of a different way of communicating, which can employ alternative methods for it, for example a person who invents a new communication system or someone who expresses themselves through unconventional methods, for example a writer who is also not a friend of the most usual interpersonal communication, therefore it is not a defect but rather a different way of approaching communication.
Mercury is the God of winged feet and caduceus who influenced sales and commerce.
You can observe by looking at any astrology software or on the Internet that some planets have an "R" that either precedes them or is at the end, that is the way to indicate the retrograde motion of a planet.
The most common utility of Mercury when observing its retrograde motion is to anticipate the most propitious moments to advance in the matters that are its own, being more favorable to conduct a deal, sign an agreement, make a trip to open opportunities, or place a new computer or telephone system during direct motion, and retrograde motion is more favorable for reviewing what has been previously mentioned, and also for internalizing what has been learned. For example, it would be better to begin a study with direct motion and review with retrograde, make a trip with direct motion and return with retrograde, investigate a new field with direct motion or review previous investigations with the R. It is ultimately one more way of using astrology in a practical manner.
