"The Twilight Saga" is a film series based on the popular book series by Stephenie Meyer. It consists of five movies that blend romance, fantasy, and drama with a supernatural twist. Here's a brief overview of the series:

1. **Twilight (2008)**: The first film introduces Bella Swan, a teenage girl who moves to the small town of Forks, Washington, and falls in love with Edward Cullen, a vampire. The movie explores their burgeoning relationship and the complications that arise from Edward's vampiric nature.

2. **New Moon (2009)**: In the second installment, Edward leaves Bella to protect her from the dangers of his world, causing Bella to fall into a deep depression. During this time, she forms a close bond with Jacob Black, a werewolf, which creates a love triangle.

3. **Eclipse (2010)**: The third film sees Bella caught between her love for Edward and her friendship with Jacob. As a new threat arises in the form of a vengeful vampire, Bella must make choices that will affect her future and her relationships.

4. **Breaking Dawn – Part 1 (2011)**: This installment focuses on Bella and Edward's wedding and subsequent pregnancy. Bella's pregnancy is difficult and dangerous, leading to significant changes in her life and the dynamics of her relationships.

5. **Breaking Dawn – Part 2 (2012)**: The final film deals with the aftermath of Bella's transformation into a vampire and the birth of her child. The Cullen family faces off against the Volturi, a powerful vampire coven, in a dramatic showdown to protect their family.

The films, directed by Catherine Hardwicke (for the first film), Chris Weitz, David Slade, and Bill Condon, gained significant popularity for their portrayal of the love story between Bella and Edward, as well as for their exploration of vampire lore and supernatural elements. They sparked a massive fan following and contributed to the vampire romance genre's popularity in the late 2000s and early 2010s.