As Roma
In short
AS Roma is a professional Italian football club based in Rome that competes in Serie A. The club has won three league titles and several domestic and European trophies.
In plain words
It is a famous sports team from Rome. They play football in the highest level of Italian competition. Fans call them the Giallorossi because of their yellow and red colours.
A simple example
When Roma plays a match at the Stadio Olimpico, thousands of supporters wear red and yellow shirts to cheer them on.
Why it matters
The club is a major symbol of Roman identity and culture. They are one of the most successful and supported teams in Italy.
Easy to mix up
Do not confuse them with Lazio, which is their local rival from the same city.