# Temporal Dead Zone (TDZ) When you have declared a variable using const or let keywords inside a scope (a pair of curly brackets), the TDZ refers to the part of code * starting from the 'start' curly bracket of the scope * to the like of the code where the variable is declared It basically means the variable cannot be used in this part of the code even though it belongs to the scope. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bharat-tiwari.gitbook.io/our-tech-journal/javascript/temporal-dead-zone-tdz.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.