MicroVMs, such as Firecracker, are lightweight virtual machines that offer the security and isolation of traditional VMs with the resource efficiency of containers, making them ideal for running multiple high-performance workloads concurrently. Developed by AWS to optimize its serverless offerings like Lambda and Fargate, Firecracker is built in Rust and uses the Linux Kernel-based Virtual Machine (KVM) to create microVMs. Firecracker's minimalist design results in reduced memory overhead and fast startup times, allowing for up to 150 microVMs per second per host, and it offers strong isolation through features like jailer and seccomp BPF. These microVMs provide a higher level of security than containers, making them suitable for running untrusted and multi-tenant workloads, and they are processor agnostic, supporting 64-bit Intel, AMD, and ARM processors. Firecracker's built-in rate limiter allows for efficient resource distribution, enabling cloud providers to run more workloads with less overhead, thus revolutionizing serverless possibilities by combining the benefits of containers and traditional VMs.