Like Dissolves Like

Dissolving is to make a solution by the means of breaking up and mixing different particles or elements.
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LIKE DISSOLVES LIKE
"The Like Dissolves Like" rule explains which kinds of solutes will dissolve in which kind of solvent. Basically, polar solvents will dissolves polar solutes and nonpolar solvents will dissolve nonpolar solutes. ;)
So what exactly does "like dissolves like" mean?