What is the difference between an app setting and a connection string in an Azure Function?

 In an Azure Function, app settings and connection strings are used to store configuration information that is required by the function at runtime. The main difference between app settings and connection strings is the type of information that they store.

An app setting is used to store any kind of configuration information that is not related to a database connection, such as API keys, URLs, or any other settings that your function might need. App settings are typically key-value pairs that can be accessed by your function through the configuration object.

On the other hand, a connection string is used to store information that is required to connect to a database or other external resource, such as a storage account. Connection strings typically include information about the server name, database name, username, and password.

While both app settings and connection strings are used to store configuration information, it is important to note that connection strings are more sensitive in nature, and should be treated with extra care. For example, you might choose to store your connection strings in a key vault or use Azure Key Vault references to prevent unauthorized access to this sensitive information.