Jobs, processes and threads

Zircon exposes three main kernel objects for running code:

• Thread: Thread of execution within a given address space.
• Process: Set of executable instructions run in a private, isolated address space.
• Job: Group of related processes and jobs. All jobs form a single rooted tree.

![Tree diagram illustrating Fuchsia's process hierarchy. Processes are grouped into jobs, which are ultimately owned by the Root Job.] (/docs/get-started/images/intro/processes-jobs.png){: width=“549”}

Processes form the basis for system capabilities. Each process is granted a set of capabilities through the various handles it holds.

Fuchsia software may or may not run within the confines of a single process. Jobs allow “applications” that are composed of more than one process to be controlled as a single entity.