ext4 is a widely used file system for Linux operating systems. It is an evolution of the previous ext3 file system, offering improved performance, reliability, and support for larger storage devices. ext4 can handle file sizes up to 16 terabytes and volumes up to 1 exabyte, making it suitable for both personal and enterprise use. One of the key features of ext4 is its journaling capability, which helps protect data integrity by keeping a log of changes before they are committed. This reduces the risk of data loss in case of a system crash or power failure. Additionally, ext4 supports delayed allocation, which enhances performance by optimizing how data is written to the disk.