In German, "weil" and "dass" are both conjunctions, but they serve different purposes and are used in different contexts.

### **Weil**

- **Meaning**: "because"

- **Function**: It introduces a subordinate clause that provides a reason or explanation for something mentioned in the main clause.

- **Example**: "Ich bleibe zu Hause, weil es regnet."  

  (I am staying at home because it is raining.)

- **Word Order**: In a sentence with "weil," the verb moves to the end of the subordinate clause.

### **Dass**

- **Meaning**: "that"

- **Function**: It introduces a subordinate clause that reports what someone says, thinks, or feels. It can also specify or clarify information.

- **Example**: "Ich glaube, dass es morgen schneit."  

  (I believe that it will snow tomorrow.)

- **Word Order**: Similar to "weil," the verb moves to the end of the clause.

### **Key Differences**

- **Reason vs. Reporting**: "Weil" explains reasons, while "dass" is used for reporting information or statements.

- **Context of Use**: Use "weil" when you want to explain why something happens, and "dass" when you want to convey what someone believes, knows, or says.

### **Summary**

- **Weil**: used to give reasons; means "because."

- **Dass**: used to indicate reported speech or information; means "that."

Understanding when to use each can significantly improve your German sentence structure!