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When we call for "Rain" (as in, "Rain at Times", "a rainy day", "Occasional rain") is a more widespread event. Most, if not all, of the area will see rain and it"ll last for a while. "Showers" are more scattered. That usually means that not everyone will be getting wet at the same time.
Thereof, what does slight chance of rain mean?
Chance of rain, aka the chance of precipitation and probability of precipitation (PoPs), tells you the likelihood (expressed as a percentage) that a location within your forecast area will see measurable precipitation (at least 0.01 inch) during a specified time period.
Also asked, what is the definition of light rain?
Light rain — when the precipitation rate is < 2.5 mm (0.098 in) per hour. Heavy rain — when the precipitation rate is > 7.6 mm (0.30 in) per hour, or between 10 mm (0.39 in) and 50 mm (2.0 in) per hour. Violent rain — when the precipitation rate is > 50 mm (2.0 in) per hour.
If the forecaster is only 50% sure that precipitation will occur, and expects that, if it does occur, it will produce measurable rain over about 80 percent of the area, the PoP (chance of rain) is 40%.