I also really like the explanation provided:
We rightly admire Muslim neighbors and co-workers who put everything on hold five times a day in answer to the "call to prayer." But Christians have a "call to prayer," too! It is the Angelus. Three times a day (at 6:00 a.m., noon and 6:00 p.m), we pause to reaffirm our faith in the Incarnation: that "God so loved the world he sent his only Son" (Jn 3:16), who "worked with human hands, thought with a human mind and loved with a human heart." God knows what life on earth is like: he lived on this very planet of ours! And so "it is right to give him thanks and praise" for "having not spared his Son, but delivering him up for us."
This video was prepared to help you learn and pray the Angelus. Once you have made this practice part of your daily prayer life, you can use the video to invite others to renew their faith in this "pivot point" of the Christian creed, in which the mysteries of the Trinity and of our Redemption in Christ come together. If we are Christians, we need to "know him whom we have believed"! The Angelus can help."