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Could you please help me understand the Wiki’s explanation of the rate of chemical reaction?

It says: the rate of the chemical reaction is directly proportional to the product of the activities or concentrations of the reactants.

I can’t wrap my head around this statement. Could anyone explain it in other words please?

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    $\begingroup$ Simply put, if your reaction is A+B, then it is [A]*[B]. $\endgroup$ – Ivan Neretin Oct 3 '20 at 18:12
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    $\begingroup$ It isn't.$\mathstrut$ $\endgroup$ – Ivan Neretin Oct 3 '20 at 18:59
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    $\begingroup$ Not only that, but it says how exactly rate depends on concentrations. $\endgroup$ – Ivan Neretin Oct 3 '20 at 19:07
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    $\begingroup$ The quoted statement is only true if the reactants are directly reacting in an elementary step. $\endgroup$ – Zhe Oct 3 '20 at 19:52
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    $\begingroup$ Wiki ≠ Wikipedia. Also, the URL to the target article is missing, and questions like this are usually getting closed as opinion based since it is essentially a request to digest studying material. This corresponds to the cognition, not chemistry. $\endgroup$ – andselisk Oct 3 '20 at 20:13
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The rate of a reaction, or how fast reactants become products, depends on the collisions of particles. This is because when a particle collides, the reaction occurs (provided that it has enough KE). So, if we increase the amount of particles (the concentration), we will have more collisions and therefore the reaction will go by faster.

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