> ## Documentation Index > Fetch the complete documentation index at: https://nocode-docs.zeroagent.io/llms.txt > Use this file to discover all available pages before exploring further. # Declare Variable The Declare Variable block is used to define a variable within the workflow. A variable can be declared with one of five data types: 1. Text 2. Number 3. Boolean 4. List 5. Time Each datatype has certain properties that can be used. ### Text Stores string data allowing you to create and manage string-based variables. text The text datatype has the following properties that can be used. | Operations         | Description             | | ------------------ | ------------------------------------------------ | | Set     | Declare a string or Overwrite an existing string | | Prepend     | Add string value at start | | Append | Add string value at end | ### Number Stores numerical data, representing quantities, counts, or measurements. number The number datatype has the following properties that can be used. | Operations         | Description             | | ------------------ | ------------------------------------------------ | | Set     | Declare a number or Overwrite an existing number | | Plus     | Add a value | | Minus | Subtract a value | ### Boolean Represents true or false values, often used for making conditional decisions or indicating states. boolean The boolean datatype has the following properties that can be used. | Operations         | Description             | | ------------------ | -------------------------------------------------- | | Set     | Declare a boolean or Overwrite an existing boolean | ### List Stores an ordered collection of items of `string` or `number` data type, ideal for managing multiple values. list The list datatype has the following properties that can be used. | Operations         | Description             | | ------------------ | ---------------------------------------------- | | Set     | Declare a array or Overwrite an existing array | | Prepend     | Add a value at start of list | | Append | Add a value at end of list | ### Time Stores specific points in time (e.g., dates, timestamps) or durations (e.g., hours, minutes). time The time datatype has the following properties that can be used. | Operations         | Description             | | ------------------ | -------------------------------------------------------- | | Set     | Declare a time value or Overwrite an existing time value | [Check here](/variables/environment-variables/) to learn about how to access the variables inside the workflow.