To pass a bill over Governor's veto. This requires a two-thirds vote of the Members elected and serving.
If the President vetoes a bill, the Congress may override the veto by a two-thirds majority vote in both houses. The bill would then become law, the President's objections notwithstanding.
Authority of the legislature to overturn a rejection of legislation by the Governor.
In the United States, Congress can override a presidential veto by having a 2/3 majority vote in both the House of Representatives and Senate, thus signing the bill into law despite the president's veto. However, a bill may not be overridden if it is a pocket veto. The veto override is an example of checks and balances.