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+---
+title: Runtime
+status: Completed
+category: concept
+tags: ["application", "", ""]
+---
+
+## What it is
+
+A runtime, in general, executes a piece of software.
+It is an [abstraction](/abstraction/) of the underlying operating system that translates the program's commands into respective actions for the operating system. 
+
+In the context of [cloud native](/cloud-native-apps/), _runtime_ generally refers to container runtime. 
+A container runtime specifically implements the [Open Container Initiative](https://opencontainers.org/) specification to ensure consistent handling around different container orchestration technologies. 
+
+## Problem it addresses
+
+Without the abstraction of a container runtime, the application would have to deal with all the mechanics of each operating system, increasing the complexity of running the app. 
+
+## How it helps
+Container runtimes are a necessary component of container orchestrators such as Kubernetes. 
+They handle the container lifecycle, which does mainly three things.
+First, it defines how container images are specified and how the runtime can retrieve them. 
+Second, they handle how these images are unpacked, layered, mounted, and executed.
+Furthermore, runtimes manage hardware resources taking care of all these operating system-level actions. 
+These include resource allocation and isolation.  
+Over time, different container runtime products evolved, leading to the OCI Specification, 
+which became the standard for container runtimes. 
+
+Introducing this standard allows end users to combine any OCI-compliant runtime with any OCI-compliant container orchestrator (like Kubernetes). 
+
+## Related terms
+
+- [Cloud Native](https://glossary.cncf.io/cloud-native-apps/)
+- [Containerization](https://glossary.cncf.io/containerization/)
+- [Container Orchestration](https://glossary.cncf.io/container-orchestration/)
+- [Microservices Architecture](https://glossary.cncf.io/microservices-architecture/)
diff --git a/wordlist.txt b/wordlist.txt
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--- a/wordlist.txt
+++ b/wordlist.txt
@@ -29,6 +29,8 @@ cd
 cdn
 changelog
 chatbot
+cgroup
+cgroups
 cio
 cka
 ckad
@@ -131,12 +133,15 @@ mkdn
 mtls
 multitenancy
 multitenant
+namespace
+namespaces
 navbar
 observability
 oci
 oliveira
 opencontainers
 orchestrator
+orchestrators
 overdemand
 overprivileged
 paas