ID:

Any valid ID (18 character force.com identifier). If you set ID to a 15 character value then apex converts its value to its 18 character representation.

Note: All invalid ID values are rejected with a runtime exception.

Blob:

A collection of binary data stored as a single object.

Blob is typically used to store images, audio or other multimedia objects and sometimes binary executable code is also stored as a blob. We can convert this datatype to string or from string using the toString() and valueOf() methods.

Ex: String s = ‘abc’;

Blob b = Blob.valueOf(s);

String s1 = b.toString();

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