Gravity is a natural phenomenon by which all things with mass or energy are brought toward one another. Today, the phenomenon of gravity is explained by two theories: Newton’s law of universal gravitation and Einstein’s general relativity.
Flat-Earthers take the existence of the two explanations as inconsistency in science and use it as a “proof” of deliberate misconduct. Such allegation is obviously only a result of their prejudice. The two theories are the correct explanations of gravity, and can reliably predict the outcome of the phenomenon.
“Gravity” is the name of the phenomenon. Newton’s law of universal gravitation and Einstein’s general relativity explain the phenomenon. Newton’s law of universal gravitation describes gravity as a force, while Einstein’s general relativity describes it as a result of space-time curvature.
Newton’s law of universal gravitation is more straightforward and gives sufficiently accurate results for most everyday usage. General relativity is far more accurate, but also much more complicated. General relativity can explain phenomena which cannot be explained using Newton’s law, and also describes some events unrelated to gravity.
However, there are very few cases involving gravity in our everyday lives that cannot be explained by Newton’s law of universal gravitation. It is why Newton’s law of gravity is used in a majority of situations in our lives.
The two theories are two separate explanations of the same phenomenon we call ‘gravity.’ Both are valid and correct, only with different complexity and accuracy.