In English, most native speakers use redundancies regularly. This is when a word is added (sometimes for emphasis) but it actually has no meaning because it is a repetition.

These, and similar expressions, should be avoided:

absolutely sure, brief summary, completely eliminate, current status, end result, firm decision, foreign imports, free gift, future goals, future planning, greater metropolitan area, internal staff, major breakthrough, major disaster, mutual cooperation, new discovery, new innovation, past experience, past history, same exact, specific details, unexpected surprise.

These are redundant because, for example, all disasters are major – a disaster cannot be minor.