# Core application - Temporal feature

> Discover Temporal's Workflow, Activity, and Worker framework; orchestrate steps, encapsulate business logic, and execute code efficiently using the Temporal SDK in your favorite language.

**Workflows**, **Activities**, and **Workers** form the core parts of a Temporal Application.

**Workflows**: A Workflow defines the overall flow of the application.
You write it in your programming language of choice using the Temporal SDK.
Conceptually, a Workflow specifies a sequence of steps and orchestrates the execution of Activities.

**Activities**: An Activity is a method or function that encapsulates business logic prone to failure (e.g., calling a service that may go down).
The system can automatically retry these Activities upon some failures.
Activities perform a single, well-defined action, such as calling another service, transcoding a media file, or sending an email message.

**Workers**: A Worker executes your Workflow and Activity code.

**Follow one of our tutorials to [Get started](https://learn.temporal.io/getting_started/) learning how to develop Workflows and Activities and run them in Worker Processes.**

Or jump straight to a Temporal SDK feature guide:

**Related:**

- [Go SDK Core application feature guide](/develop/go)
- [Java SDK guide](/develop/java)
- [PHP SDK Core application feature guide](/develop/php)
- [Python SDK Core application feature guide](/develop/python)
- [TypeScript SDK Core application feature guide](/develop/typescript)
- [.NET SDK Core application feature guide](/develop/dotnet)
- [Ruby SDK Core application feature guide](/develop/ruby)

For a deep dive into Temporal Workflows, Activities, and Workers, visit the following Temporal Encyclopedia pages or enroll in one of [our courses](https://learn.temporal.io/courses/).

- [Temporal Workflows](/workflows)
- [Temporal Activities](/activities)
- [Temporal Workers](/workers)