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technology/files/YAML.md

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+---
+obj: concept
+website: https://yaml.org
+wiki: https://en.wikipedia.org/wiki/YAML
+---
+
+# YAML
+YAML is a data serialization language designed to be human-friendly and work well with modern programming languages for common everyday tasks. Additionally any valid [JSON](JSON.md) document is also a valid YAML document.
+
+## Syntax
+### **Indentation:**
+Indentation is used to represent the structure of the data. Spaces or tabs can be used, but consistency is crucial.
+
+### **Key-Value Pairs:**
+Data is represented as key-value pairs using a colon (`:`) to separate the key and value.
+
+### **Comments:**
+Comments can be made with `#` symbol.
+
+```yaml
+key: value # My Comment
+# Another comment
+```
+
+### **Lists / Sequences:**
+Lists are represented using a hyphen (`-`) followed by a space.
+```yaml
+key: value
+list:
+- item1
+- item2
+```
+
+### **Mappings:**
+Mappings represent key-value pairs.
+
+```yaml
+key: value
+nested:
+	key: value
+```
+
+### Data Types
+YAML support many different data types such as strings, numbers and booleans.
+
+```yaml
+mystr: "Hello World"
+mynum: 3
+myfloat: 3.1415
+mybool: true
+multiline: |
+	hello world
+	this is multiline
+key: value
+```
+
+## Common Use Cases
+### 1. **Configuration Files:**
+YAML is widely used for configuration files in applications and systems.
+
+### 3. **CI/CD Pipelines:**
+Many CI/CD tools, such as GitLab CI and [GitHub Actions](../applications/development/GitHub%20Actions.md), use YAML for defining pipelines.