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# Terminology # Terminology
## Cluster Terms ## Cluster Terms
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| task | The smallest unit of work in Nomad. Tasks are executed by task drivers like `docker` or `exec`, which allows Nomad to be flexible in the types of tasks it supports. Tasks specify their required task driver, configuration for the driver, constraints, and resources required. | | task | The smallest unit of work in Nomad. Tasks are executed by task drivers like `docker` or `exec`, which allows Nomad to be flexible in the types of tasks it supports. Tasks specify their required task driver, configuration for the driver, constraints, and resources required. |
| group | A series of tasks that run on the same Nomad client. | | group | A series of tasks that run on the same Nomad client. |
| job | The core unit of *control* for Nomad and defines the application and its configuration. It can contain one or many tasks | | job | The core unit of *control* for Nomad and defines the application and its configuration. It can contain one or many tasks |
| job_specification/jobspec | A job specification, also known as a jobspec. | | job_specification/jobspec | A job specification, also known as a jobspec defines the schema for nomad jobs. This describes the type of the job, the tasks and resources necessary for the job to run, job information like which clients it can run on, or more. |
| allocation | An allocation is a mapping between a task group in a job and a client node. When a job is run, Nomad will chose a client capable of running it and allocates resources on the machine for the ask(s) in the task group defined for the job. | | allocation | An allocation is a mapping between a task group in a job and a client node. When a job is run, Nomad will chose a client capable of running it and allocates resources on the machine for the ask(s) in the task group defined for the job. |
# Resources
https://developer.hashicorp.com/nomad/tutorials/get-started/gs-overview