When a function is decreasing, it means that as you move from left to right along the graph of the function, the y-values are getting smaller.
A local minimum is a point on a graph where the function reaches its lowest value in a small interval around that point.
An inflection point is a point on a graph where the concavity changes from concave up to concave down, or vice versa.
Monotonic Function: A monotonic function is either always increasing or always decreasing throughout its entire domain.