homework?
a data structure is a collection of data with an inherent or otherwise contrived, in any case pre-determined, order.
they do nothing...by themselves. because the order is pre-determined, so are the methods to create/read/update/delete elements at will. In fact, it could be said that a data structure is defined through the access methods
how does a data structure look like?..hmm...about 6 feet tall...only kidding. pick any ordered data, e.g. spreadsheet.