Is There a Difference between a Sermon and a Homily?

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On Ad Council's BelongingBeginsWithUs-site, we are given several ways to "Join in" (to learn how to help bring others into our various communities, I suppose; and "to make sure everyone in your community feels like they belong). On their 'join in'-page, we are given the options (among many others) to "Listen to a homily about belonging" or to "Hear a sermon about belonging." I can find the difference, but first I want to know if YOU know if there's a difference? In case you don't know what a 'homily' is: in the Catholic 'Mass' (i.e. church-service), we'll often listen to a few readings from The Bible & then the priest will come up to the pulpit (or -will STAY there, as they're often the one to do the day's last reading) and will give 'a talk'---usually about 'how the day's readings apply to current events.' The difference between that homily and a sermon--then--is 'its launchpad' ... the homily launches from recently-read scripture-passages; the sermon, from the sermonizer's group's (church's, class's, family's) current concerns? What do YOU think the difference is (between a sermon and a homily)?