Answer:
I don't know how long your answer is supposed to be but here's a longish explanation.
In the book of Matthew, Jesus himself is the one who teaches the Apostle's 'the Lord's Prayer', he says that when they pray not to be like "hypocrites" who love to pray on street corners and in other public places so everyone can see them. They are just showing off. He tells them to go into their own room and pray in private because it only matters that the Lord hears them.
Then he says, "Pray like this:" and says the prayer. It's like a direct conversation with God the Father, saying "Our Father who art in heaven hallowed be thy name."
So, to paraphrase in more modern language, God, the Father of us all who I believe is up in Heaven, your very name is "hallowed" or holy.
"Thy Kingdom come, thy will be done, on Earth as it is in Heaven." Everything that happens both on Earth and in Heaven is according to the Lord's will. I know your Kingdom is coming (the final judgment and reward for the faithful) and everything that you have promised is going to be done. God is all powerful in Heaven and on Earth.
"Give us this day our daily bread and forgive us our trespasses as we forgive those who have trespassed against us." Basically, Please let us have enough to eat and forgive us, as humans, the sins we commit every day and we will forgive other humans too, since that's what Jesus said to do.
"And lead us not into temptation but deliver us from evil. " Please help me (us) to avoid temptation and help me escape evil." I think this is the main reason people say this prayer every day, because it reminds them of the Lord's promises to them as well as the things they are supposed to watch out for (like temptation and being unforgiving or not believing that God is in charge of everything.) It's simple but also not easy to always trust that a merciful God would allow all the bad things that happen to happen. Probably the hardest thing for many to deal with when trying to be a faithful Christian.
Now, I don't know what school class you are doing this for, so just know that this is my interpretation based on reading and schooling. I am a lapsed Catholic myself. In the Catholic Church the individual doesn't go on to this last part, but it's often included in the Mass by the Priest and in Protestant churches it's part of the prayer for everyone.
"For thine is the kingdom and the power and the glory for ever and ever." Amen. So, that part means, "Because you Lord, own or rule over the "Kingdom"-- basically <em>everything</em>, the whole world, and all the people and their souls plus all of Heaven for ever and ever. For all time and beyond God is King and rules everything, everyone, infinity and beyond.
Explanation: The Lord's Prayer is a faithful Christian's chance to communicate directly with God every day and reinforce their belief that the Lord is all powerful and rules Heaven and Earth and that it is the Christian's obligation to God the Father, as well as Jesus, to avoid sin and temptation, and to forgive other people and not be a hypocrite, who just prays to impress people and look good. All true power comes through God. (Hope this helps.)
