# Documentation

LLMS index: [llms.txt](/llms.txt)

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OpenTelemetry, also known as OTel, is a vendor-neutral open source
[Observability](concepts/observability-primer/#what-is-observability) framework
for instrumenting, generating, collecting, and exporting telemetry data such as
[traces](concepts/signals/traces/), [metrics](concepts/signals/metrics/), and
[logs](concepts/signals/logs/).

As an industry-standard, OpenTelemetry is
[supported by more than 90 observability vendors](/ecosystem/vendors/),
integrated by many [libraries, services, and apps](/ecosystem/integrations/),
and adopted by [numerous end users](/ecosystem/adopters/).

![OpenTelemetry Reference Architecture](/img/otel-diagram.svg)

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Section pages:

- [What is OpenTelemetry?](/pl/docs/what-is-opentelemetry/): A brief explanation of what OpenTelemetry is and isn't.
- [Getting Started](/pl/docs/getting-started/): Get started with OpenTelemetry based on your role.
- [OpenTelemetry Concepts](/pl/docs/concepts/): Key concepts in OpenTelemetry
- [OpenTelemetry Demo Docs](/pl/docs/demo/)
- [Language APIs & SDKs](/pl/docs/languages/): OpenTelemetry code instrumentation is supported for many popular programming languages
- [Platforms and environments](/pl/docs/platforms/): Hardware & software platforms and environments supporting OpenTelemetry
- [Zero-code Instrumentation](/pl/docs/zero-code/)
- [Collector](/pl/docs/collector/): Vendor-agnostic way to receive, process and export telemetry data.
- [Blueprints and reference implementations](/pl/docs/guidance/): Blueprints and sample architectures for best practices when adopting and implementing OpenTelemetry in common environments
- [Compatibility](/pl/docs/compatibility/): Learn how to integrate OpenTelemetry with other observability technologies
- [Security](/pl/docs/security/)
- [Contributing](/pl/docs/contributing/)