On to geopolitics: In the beginning, there is the Galactic Republic—very Rome with duplicitous senators and such. Here is an image of the flag of the Galactic Republic. The Jedi are like the Navy SEALS of the Republic. The Republic's Washington, D.C., is a planet called Coruscant. The Clone Wars start when a bunch of star systems secede from the Republic and form the Confederation of Independent Systems. These rebellious planets are the Separatists/Confederacy. More confusion! In the O.T., the rebel alliance are the good guys, but in the Clone Wars, the separatists are the rebels with the droid armies. The Separatists/Confederacy are led by Count Dooku, a renegade Jedi. He trained General Grievous, the four-armed cyborg who freaks my kids out.*
To summarize: Republic + Jedi + clones + blue blasters vs. Separatists/Confederacy + Dooku + droids + orange blasters. Onward. The Jedi use the light side of the force, while their ancient enemies, the Sith lords, use the dark side of the force. Major spoiler alert in the next sentence for those who haven't been paying attention! Chancellor Palpatine, a distinguished looking gentleman who dominates the Senate, is actually the craggy, white-faced emperor from The Return of the Jedi, also known as Darth Sidious. Before he's unmasked as a Sith lord, he plays both sides of the Clone Wars, undermining the Jedi and fomenting conflict so that he can lead a newly formed Galactic Empire. This is the good old Empire with the Imperial star destroyers, incompetent generals, and TIE fighters that O.T. parents know and love.
The proper order of the Star Wars galaxy comes completely into place with the Great Jedi Purge. During a key moment in the Clone Wars, Palpatine issues order 66. To give due credit: this is the amazingly poignant montage in the sixth movie where the clones turn on the impressively diverse Jedi and mow them down. A most epic disturbance in the force. Clones are created to follow orders and 66 is a command to destroy the Jedi if they are a threat to the Republic. That's not true, Palpatine is simply being evil and establishing his power. The clones now become his personal army of stormtroopers. Nearly all the Jedi are decimated except for Obi-Wan and Yoda. Unfortunately, because Jedi are awesome, your kids will ask you questions about random Jedi like Kit Fisto, Mace Windu, and Plo Koon. Trust in Wookieepedia, you must.
In addition to the Separatists, the Trade Federation has droids and is generally up to no good in a greedy banker way. It's safe to ignore the Trade Federation. Chewbacca and the Wookiees have their own unspellable planet now. They live in primitive style, like more badass versions of Ewoks. Jar-Jar Binks is a Gungan. I think the Gungans live underwater. Naboo is the planet where Padmé is from, but the adjective Nubian refers to the planet Nubia. The Skywalkers are from Tatooine—two suns, podracing. Count Dooku gives the plans for the Death Star to the emperor. Padawans can be thought of as Jedi middle-schoolers. Ahsoka is definitely a girl. Hayden Christensen can't act. I really have no idea who that scary albino bald woman is, sorry.
The Force? How does the Force work, you ask? The Force "surrounds us. . . and binds us." It is biological in nature, as individuals who are "Force-sensitive" have a lot of these things called midi-chlorians in their blood. You can definitely use the Force. It's never, ever a good idea to use the Force to choke your little brother.
Q: Does R2-D2 have shooters?
A: Yes. He does have a shooter in his body. He also has a propeller, a lasso, and shock arm.
Q: Can R2-D2 fly?
A: Yes. But only for short distances.
Q: What does R2-D2 eat?
Q: Who is R2-D2's friend?
A: That is C-3PO.
Q: Why does Daddy talk funny when he is C-3PO's friend?
A: Daddy does a bad British accent.
Q: Is there a bad R2-D2?
A: Yes. There is an assassin droid that is a bad R2-D2.
Q: Does R2-D2 sleep?
A: Yes. R2-D2 always goes to sleep quickly without asking for water.
Bonus bonus section for O.T. parents:
My Star Wars research reveals that Princess Leia and Han Solo get married and have three children. Plus, R2-D2 gets handed down through the Skywalker family like a trusty old hunting rifle. He is currently helping Cade Skywalker (directly descended from Luke) fight a restored Sith empire.
Correction, Oct. 14, 2011: This article originally misspelled the name of General Grievous. (Return to the corrected sentence.)