It slept for millions of years, then, when humans appeared in the area, It awoke and began a feeding cycle lasting about a year, feeding on people's fears and frequently assuming the shape of whatever its prey feared the most. After feeding, It would resume hibernation for approximately 30 years before reappearing.
IT arrived on Earth through an event similar to an asteroid impact, landing in what would later become Derry, Maine. Once there, IT adopted its usual pattern of hibernation that lasted between 27 and 30 years, awakening to kill and eat and then going back to sleep.
Bill Skarsgård as Pennywise the Dancing Clown: An ancient predatory creature from another dimension which was brought to Earth millions of years ago by a meteorite. It awakens every 27 years to feed on the fear of children that it kills.
The novel explains that IT landed on Earth during an asteroid impact and established itself under the land Derry would be later built on, and initially preyed on indigenous tribes. From that point of view, IT/Pennywise would be billions of years old, but his clown shape wouldn't be that old.
Throughout the book, It is generally referred to as male, usually appearing as Pennywise. The Losers come to believe It may be female after seeing it in the form of a monstrous giant spider that lays eggs.
According to It, when humans got scared, "all the chemicals of fear flooded the body and salted the meat". This is why he prefers to feast on children -- their fears are simple, pure, and powerful compared to the complex, pathological fears of adults. Basically, children are delicious.
However, It must surrender the the laws of whatever shape It takes. Pennywise's strength is also his weakness. For example, if he were to take the shape of a werewolf (as he does in the novel), silver bullets would harm him.
There was a human Pennywise the Dancing Clown, but IT just takes his form. In the movie canon, Pennywise the Dancing Clown was a real person whose image IT decided was a terrifying enough basis for his child-scaring campaign.
It is the real monster behind the monster. If you want to get technical, It is an alien, but It's origin goes well beyond that. It is actually an ancient cosmic deity. A god of destruction, not just of our world, but of multiple worlds and even multiple universes.
The spider-clown shrinks as the Losers hurl taunts at It, until it's tiny and weak enough that they pluck out its heart and squash it into nothingness. In the end, they defeat Pennywise by, uh, making him feel really bad about himself. It author Stephen King.
They reach the conclusion that Pennywise has all of the adults under some sort of spell that prohibits them from seeing him. The adults of Derry are shown to be villainous in their own right as well. The adults of Derry are shown to be true villains of the story in the same way as Pennywise.
[Stephen King's IT] Why doesn't Pennywise go after adults the way he goes after kids? Pennywise's deal is that he strikes fear into the hearts of others before devouring them, as essentially fattening them up before he feasts.
A Tumblr user offers an explanation on why Pennywise's preferred target are children, and it's not so much because their fears are less complex than those of adults, but because IT is all about child abuse.
Stephen King's IT introduced readers to a one-of-a-kind creature that can take any form, the most common one being Pennywise the Dancing Clown, and as menacing as it is, this creature has one big enemy it's truly scared of: Maturin, the turtle.
(According to King's book, Pennywise actually is a spider—sort of. That's really just the closest visual approximation to what Pennywise's true form actually is, at least to our puny human minds.)
Kersh is Pennywise's daughter. Or at least the daughter of the man who originally had Pennywise's face. Additionally, the trailer offers a first glimpse of Bill (James McAvoy), Ben (Jay Ryan), Richie (Bill Hader), Eddie (James Ransone), and Mike (Isaiah Mustafa) back together.
Regardless, she's one nasty beast and not alone due to the egg sack she's carrying. Unfortunately, King's imagination ran a little wilder than alluded to in the movies or earlier in the books, and the consequence of that is a pregnant Pennywise.
Pennywise does not need to scare his victims in order to kill them, he simply prefers to. The reason he does this is because it supppsedly tastes better. He says it's like "salting the meat." Pennywise feeds off the fear as much as he does the consumption of Children.
As many as billions of years old, Pennywise originated in a realm outside the known universe called the “Macroverse.” Though not confirmed, it's been suggested in the “Dark Tower” series that Pennywise was created by a being known as “the Other,” which may be the godlike figure known as Gan, who is also the embodiment ...
Muschietti appears to be implying Pennywise was a human familiar who It corrupted and then enjoyed so much It incorporated his shape into its file cabinet of monsters.
In the opening scene, viewers are treated to Pennywise's (Bill Skarsgård) first kill, which is as devastating as it is terrifying. Little Georgie Denbrough (Jackson Robert Scott) is out innocently playing on a rainy day when the evil clown sinks his teeth into him.
It was said on page 1361 that the Spider being both female and pregnant was a symbolic interperetation. Its not literal, but a representation of whatever equivalent but inconceivable reproductive capability It actually has.
