# Concepts

- [Lowering](/hylo-ir/concepts/lowering.md)
- [Modules](/hylo-ir/concepts/modules.md)
- [Lowered functions](/hylo-ir/concepts/lowered-functions.md)
- [Operands](/hylo-ir/concepts/operands.md)
- [Abstract machine](/hylo-ir/concepts/abstract-machine.md)