You asked:

what is meant by conflict

'Conflict' has lots of meanings including: as a verb, 1. be in conflict; 2. go against, as of rules and laws; and as a noun, 1. an open clash between two opposing groups (or individuals); 2. opposition between two simultaneous but incompatible feelings; 3. a hostile meeting of opposing military forces in the course of a war; 4. a state of opposition between persons or ideas or interests; 5. an incompatibility of dates or events.