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33 lines
2.1 KiB
Markdown
33 lines
2.1 KiB
Markdown
---
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id: index
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title: Introduction
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---
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Welcome to the Unleash getting started guides. We know that getting to know a new solution might be tedious. Our goal with this documentation is to guide you through the most essential concepts of Unleash.
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One of the most important aspects of the architecture to understand is that feature toggles are evaluated in a client SDKs which runs as part of your application. This makes toggle evaluations super-fast, but of course it compromises a small update-delay when you change your toggle configurations (in terms of seconds and is configurable).
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We recommend that you read about [our unique architecture](https://www.unleash-hosted.com/articles/our-unique-architecture) to understand some of the basics of the architecture.
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## Unleash Server
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Before you can connect your application to Unleash you need a Unleash server. You have a few options available.
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1. [Unleash Open-source - Self-managed](/docs/deploy/getting_started)
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2. [Unleash Enterprise - Cloud-hosted](https://www.unleash-hosted.com)
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3. [Unleash Enterprise - Self-hosted](https://www.unleash-hosted.com)
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## System Overview
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Unleash is composed of three parts:
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- **Unleash API** - The service holding all feature toggles and their configurations. Configurations declare which activation strategies to use and which parameters they should get.
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- **Unleash UI** - The dashboard used to manage feature toggles, define new strategies, look at metrics, etc.
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- **Unleash SDK** - Used by clients to check if a feature is enabled or disabled. The SDK also collects metrics and sends them to the Unleash API. Activation Strategies are also implemented in the SDK.
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To be super fast (*we talk nano-seconds*), the client SDK caches all feature toggles and their current configuration in memory. The activation strategies are also implemented in the SDK. This makes it really fast to check if a toggle is on or off because it is just a simple function operating on local state, without the need to poll data from the database.
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