Well, at least until they start pushing a normal, average moon as a “supermoon” just for clickbait.
What it absolutely is is a full moon, about two hours past full. So, a 99.9% full moon.
Remember, the Moon’s orbit isn’t perfectly round, so sometimes when it’s at full moon, directly opposite the Earth from the Sun, sometimes it that instant it’s a bit closer, sometimes a bit further away. Most of the time it’s about average. On those handful of times per year when it’s closer than average, the clickbait mainstream media trumpets it as a “SUPERMOON!!!”
If the clickbait mainstream media wasn’t doing that, the odds of you noticing the difference would be tiny. Miniscule. Extremely unlikely.
Astronomically small. (Sorry, not sorry.)
What tonight’s supermoon is also doing is wiping out our ability to see about 90% of the Perseid meteor shower. You need a nice, dark sky to see the most meteors. The full moon is thousands of time brighter, so you can only still see the very brightest of the meteors.
Enjoy the beautiful moon! Good luck with the brightest meteors!