A petabyte (PB) is a unit of digital information storage equal to 1,024 terabytes (TB) or approximately 1 quadrillion bytes. It is commonly used to measure large data sets, such as those generated by big data analytics, cloud storage, and data centers. To put it in perspective, a petabyte can store about 500 billion pages of standard text or around 13.3 years of high-definition video. As technology advances, the need for petabyte-scale storage continues to grow, especially in fields like artificial intelligence, scientific research, and social media.