# Difference between the joint probability $P(x_2,t_2;x_1,t_1)$ and the conditional probability $P(x_2,t_2|x_1,t_1)$ [closed]

What is the difference between the joint probability $P(x_2,t_2;x_1,t_1)$ and the conditional probability $P(x_2,t_2|x_1,t_1)$ where $x_1,x_2$ are two values from the sample space of a random variable $X$? Here, $t_1$ and $t_2(>t_1)$ represent time.

It will be helpful to get an answer that will explain the meaning of these two probabilities in the example I wrote.

## closed as off-topic by Did, A. Goodier, NCh, The Phenotype, Parcly TaxelMar 1 '18 at 15:40

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