Glossary

Systems terms, each answered in under two minutes. Entries are organized by concept layer:

• Memory — bytes, stack, heap, virtual memory, page faults
• Processes — process, PID, signals, environment variables, exit codes
• Kernel — syscalls, interrupts, user space, kernel space
• Threads — threads, mutexes, race conditions, deadlocks
• Storage — inodes, file descriptors, journaling
• Containers — namespaces, cgroups, images, overlayfs

Every term links back to the lesson where it is introduced. Start with any entry or work through the lessons in order.