Approval ratings
In the United States, presidential job approval ratings were introduced by George Gallup in the late 1930s (probably 1937) to gauge public support for the President of the United States during his term. An approval rating is a percentage determined by a polling which indicates the percentage of respondents to an opinion poll who approve of a particular person or program. Typically, an approval rating is given to a political figure based on responses to a poll in which a sample of people are asked whether they approve or disapprove of that particular political figure. A typical question might ask:
Like most surveys that predict public opinion, the approval rating is subjective. Many unscientific approval rating systems exist that skew popular opinion. However, the approval rating is generally accepted as a statistically valid indicator of the comparative changes in the popular United States mood regarding a president.
Most recent polls for President Donald Trump:
Last polls for President Barack Obama:
Historical Gallup Poll approval highs and lows for each president since 1937:
...
Wikipedia