Suitable for everyday use, resistant to rain and splashes.
A watch with a 30m water resistance rating means it's splash-resistant and can withstand accidental splashes, but not prolonged submersion or rigorous water activities like swimming or showering. Essentially, it's suitable for everyday wear, handwashing, and rain, but not for activities where the watch might be submerged.
A 30m watch is considered "water-resistant," not "waterproof". "Waterproof" would mean the watch can withstand complete submersion without water intrusion.
The rubber seals that keep water out can wear out over time. Therefore, a 30m watch that has been worn for a while might not be as water-resistant as it once was.
While a 30m watch can handle splashes and light rain, it's best to avoid submerging it or exposing it to prolonged water contact