The New Deal had significant impacts in both the short and the long term.
In the short term, it helped to reduce the severity of the Great Depression. It did not end the Depression, but it improved conditions to some degree. At the same time, it helped make Franklin D. Roosevelt and the Democratic Party much more popular.
In the long term, the major impact of the New Deal was to entwine government and the economy. This was the beginning of the system we have now in which the government is held responsible for how the economy runs and in which it regulates almost every aspect of the economy.