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There is an important difference between applying stamps in a document and applying a signature.
When applying a stamp to a document, you insert an image (your signature appearance) which modifies the content of your document without adding the protection a digital signature would do. You must digitally sign your document after stamping to guarantee its integrity.
When signing a document, you embed the information certified by your digital signature into the document, identifying you as the person who approves or takes responsibility for its content.