This is Laetare Sunday, the 4th Sunday of Lent. We're halfway to Easter!
On this Sunday (and on Gaudete Sunday, the third Sunday of Advent) the priest has the option of wearing rose-colored vestments (as you see the Pope wearing below).
This Sunday is called "Laetare" from the incipit of the introit of the Mass: Laetare, Jerusalem (Rejoice, Jerusalem).
Today in our chapel, we heard the readings for the Fourth Sunday of Lent, Year B, which include this beautiful passage from the Gospel of John: "God so loved the world that he gave his only Son, so that everyone who believes in him might not perish but might have eternal life. For God did not send his son into the world to condemn the world, but that the world might be saved through him." These are definitely words to make us rejoice today!