Several times each year, Mercury's orbit appears to reverse. Today, it halts, and turns direct again, calming down some of the mix-ups and drama.
Because Mercury is the planet of communication, technology, business endeavors, and travel, when it is in its retrograde period, those matters can go a bit haywire.
The most turbulence can occur when it is slowing down and switching directions, like today. (Again... this is not actually happening to Mercury's orbit! It's from our perspective on Earth).
Like a car changing gears, the transition period can be the most chaotic.
Happily, after some possibly increased kerfuffle during today's period while it changes directions, our garbled communications, transportation, and tech should begin to settle down as well.