For example, Congress often holds business sessions only on Tuesday, Wednesday and Thursday, so that legislators can visit their constituents over a long weekend that includes a work day. At such times, Congress has not adjourned but is, instead, recessed.
Congress also recesses the week of a federal holiday.
The Legislative Reorganization Act of 1970 stipulated a 30-day recess each August, except in time of war.
During a recess, a President can execute a pocket-veto or make recess appointments. Also see Adjournment