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$\color{blue}{\vec F}=\color{olive}{m}\color{magenta}{\vec a}$
Newton's second law tells us that how an object $\color{magenta}{\text{gets faster}}$ depends on its $\color{olive}{\text{mass}}$ and the $\color{blue}{\text{total force }}$ acting on it.
Formulated a bit differently it tells us that the $\color{magenta}{\text{acceleration}}$ of an object is given by the ratio of the $\color{blue}{\text{force }}$ acting on it divided by its $\color{olive}{\text{mass}}$.
However, take note that it is not sufficient to describe a physical system. Additionally, to describe a system we need to know what forces act on the object and what equations describe them. Famous examples of such force laws are
Newton's second law is the most fundamental equation of classical mechanics. It is still used nowadays, for example, by engineers.