> ## Documentation Index > Fetch the complete documentation index at: https://docs.honeycomb.io/llms.txt > Use this file to discover all available pages before exploring further. # Observability Concepts > Build a foundation in the concepts of modern observability. Given the lack of observability training in official curriculums, many of us learned what we know from whatever ecosystem we were first introduced to and whatever observability solutions were implemented at our employers throughout our career. This method of piecing together information coupled with the breadth of types of telemetry, opinionated platforms, and data formats available today can make it challenging to wrap our heads around the concept of observability. Honeycomb hopes we can help with that by sharing the observability fundamentals that we think we should all know. To fully grasp observability, start with these concepts. Explore what OpenTelemetry is, why Honeycomb uses it as the standard for instrumentation, and how it relates to your telemetry data. Learn about distributed tracing, which helps tie together instrumentation from separate services, so you can understand complex processes. Learn about services, and how they are created and managed in Honeycomb. Learn what high cardinality and high dimensionality are, and understand what makes high cardinality data important. Understand what instrumentation is. Explore best practices and conceptual patterns for instrumenting applications. Learn about eBPF and why it is important to observability.