John 21:15, 16

This is a short passage that contains a discourse  between Jesus and Peter after the resurrection, but it contains so much, not in the English but rather in the Greek. Now, we don't have the original Aramaic or Hebrew that they might have used because at the time, Greek was used as the common language  to transmit ideas in written form so that peoples of other cultures and languages might have the ability to receive the communication, even though the writer might not speak their native tongue.
So here's what happens: Jesus has died, risen, and appeared on several occasions to his disciples. On this occasion, Peter has told the rest of the guys, "I'm going fishing!" He's at the Sea of Tiberius with Thomas Didymus (the twin), Nathaniel from Cana in Galilee, the sons of Zebedee (James and John), and two other anonymous disciples (vs. 3). They've fished all night, and just as dawn is breaking, Jesus shows up on the shore. He calls out to them over the water (sound travels far over water) to ask if they've caught anything. Now, if you've ever fished for pleasure, just fishing even without catching anything can be very peaceful and relaxing. But these are former commercial fishermen, so they're not accustomed to fishing for pleasure.
They respond to his query, not knowing who it is, probably wondering why he wants to know. And when he says "Try the other side," they may even be thinking "What does this guy know? We're the professionals!" But they do it anyway and, suddenly, the net is so full they can't haul it in. Something clicks in John's mind ("Wait a minute! Didn't this happen once before?") and he realizes it's Jesus! Peter has stripped down to his skivvies during the night and doesn't want to offend Jesus by appearing before him naked, so he puts his clothes back on before he jumps in the water and swims to shore. At least he doesn't wait for the boat to come in, so great is his desire to see Jesus.
So later, after they've had breakfast from some of the 153 large fish they brought in, Jesus starts asking Peter some questions. He says "Peter, son of Jonas, do you love me more (pleion, greater in quantity or quality) than the rest of these guys?" Now, we use "love" in English to say a lot of things. We say, "I love you" to someone who is dear to us, or "I love pizza" to express a personal preference. Greek is more explicit. Most of us are familiar with the three forms of "love" in Greek: agapao for Godly love or love by choice, phileo for brotherly love, respect, or love by preference, and eros for physical love or love by desire. Here, Jesus uses the first form, agapao. It's the same form the Apostle John uses in his most famous passage (John 3:16), "For God so loved (agape'd) the world that He gave...".
But Peter can"t hack it. He says "Yes, Lord, you know that I love/respect (phileo) You." Now, again, we don't know the Aramaic or Hebrew that they might have used, but we do have the Greek that the dialogue was written in, and in it John makes a distinction. In response, Jesus tells Peter "Boske (feed, pasture, to graze; Thayer: portraying the duty of a Christian teacher to promote in every way the spiritual welfare of the members of the church) my arnia (lambs, little lambs).
Then again, a second time, Jesus asks Peter, "Do you love (agapao) me?" "Yes, Lord (kyrie), You know that I love/respect (phileo) you." Jesus responds "Poimaine (Thayer: to feed, to tend a flock, keep sheep; to rule or govern; Strong: to tend as a shepherd (or figuratively as a supervisor) my prosbata (Thayer: any four-footed, tame animal accustomed to graze; Strong: something that walks forward [a quadruped], [specifically] a sheep [literally or figuratively]).
Then, a third time, Jesus questions him, and he uses Peter's word this time..
Why does Jesus question Peter three times? Peter had denied Jesus three times. Jesus wasn't poking Peter in the eye three times just to get back at him for the three times Peter had thrown Jesus under the bus. He was querying Peter three times to restore Peter for the three times he had failed to live up to his own oath, because a time was coming when it was going to cost him more than just his reputation, and Peter needed to know he was forgiven for that failing.