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When data is defined without specifying a specific storage class or type, the programming language assumes a default type. This default type declaration is based on the language's syntax and grammar rules.

For instance, in C programming language, a variable defined without any storage class or type is assumed to be of the type "int" by default. Similarly, in Python programming language, variables are dynamically-typed, meaning that their type is inferred at runtime based on the value they contain.

The problem with relying on default type declarations is that it can lead to unexpected behavior or errors if the value being stored does not match the default type. Therefore, it is generally recommended to explicitly declare the storage class and data type of variables to ensure that they are used as intended.