Firecracker is a lightweight virtualization technology developed by AWS to enhance serverless computing by combining the security and isolation of traditional virtual machines with the speed and density of containers. Originally derived from Google's Chromium OS Virtual Machine Monitor, Firecracker is now an open-source project under the Apache License 2.0, designed specifically to optimize serverless infrastructure. It utilizes Linux kernel-based virtual machines (KVM) to create microVMs that efficiently manage multi-tenant workloads on a single server, offering fast boot times and minimal performance overhead. Firecracker is not a general-purpose VMM like QEMU, nor a container orchestration tool like Kubernetes, but rather a specialized tool for running serverless workloads with high efficiency and security. Its minimalist design and RESTful API facilitate control over resource allocation, making it a promising technology for emerging serverless applications, with ongoing community development and potential for widespread adoption in the cloud computing industry.