When you asked me to stop, looking somewhat perplexed."
Tides are the rise of fall of sea levels, or occasionally liquids other than water, on a planet or moon due to the gravitational influence of other celestial bodies or of artificial gravity systems.
The planet Argo had strong tides. (TAS: "The Ambergris Element")
In 2366, the planet Bre'el IV experienced dangerously high tides due to a descending asteroidal moon. (TNG: "Deja Q")
In 2367, Data modeled that the moon Peliar Zel Beta would experience erratic tidal surges if no action were taken. (TNG: "The Host")
The planet Balosnee VI supposedly had a tidal harmony that could cause pleasant hallucinations. (DS9: "The Nagus")
The fifth moon of Mixtus III created tides on that planet that allowed for summer crops; it was destroyed in 2380, with artificial gravity systems the proposed solution for ensuring the tidal effects continued. (LD: "Cupid's Errant Arrow")
Tides were also used as a metaphor, for example by Gowron for the "tides of fortune", (DS9: "By Inferno's Light") or by Tam Elbrun for other people's emotions. (TNG: "Tin Man")
Note that "tidal waves" are not caused by tides, despite the colloquial name.