"Modification" refers to a change or alteration made to something, while "Amendment" specifically denotes a formal revision or addition to a document or law. "Modification" and "Amendment" are two terms commonly encountered when discussing changes, albeit in varying contexts.

Amendment typically implies a formal change to a legal or official document, often following a set procedure. Modification, however, can refer to any alteration, adjustment, or change, whether formal or informal, in various contexts. Both terms involve change, but the formality and context differ.

Modification involves making alterations to improve or adapt something. Amendment typically refers to formal changes in written documents or agreements. Revision is the meticulous process of reviewing and refining existing content, and change encompasses broad transformations in life.

"He modified his brother's essay so as to include references to Shakespeare." In broad terms, a modification adds something that was not there before and is designed to fulfil a function; an amendment corrects something or increases or decreases the scope/emphasis of something.