What does the p-value in ggscatter refers to ? [R language]

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I graphed my data of x and y using ggscatter in R. I have a result of R = 0.4 and p < 2.2e-16. I know R means that the correlation value between x and y is 0.4. However, what does the p value refer to ? I know that in hypothesis testing, we can reject the null hypothesis when the p-value is close to 0. However, in this case, what is the null hypothesis for us to reject ?

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