Open-source container platform designed around simplicity/speed/security
Optimized for HPC (high-performance computing) and shared system environments
Provides an immutable single-file container image format, with support for encryption and signing
Focuses on integration and usability rather than isolation, so GPUs, high-speed networks, and parallel file systems can be used directly in cluster/server environments
Can pull any container from OCI (Open Containers Initiative) registries, maximizing compatibility with Docker
Supports pulling, running, and building most containers on Docker Hub without changes
Renamed from Singularity and moved to the Linux Foundation as a project
Single-file containers based on SIF (Singularity Image Format) can be easily moved, distributed, and shared
Secure security model in which user permissions are the same inside and outside the container, and no additional privilege escalation on the host is possible by default