Easy, the commas separate the numerical units. 1,000 is one thousand. 1,000,000 is one million and so on.
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The commas between numbers in place value are commas.
They break down very large numbers into groups of 3 from right to left thus making them easy to read as for example 30,000,000,000 is thirty billion
Yes, they are used as separators to make numbers more legible. For instance it is much easier to read 1,000,000,000 than 1000000000
In representing large numbers, English texts use commas (or spaces) to separate each group of three digits. This is almost always done for numbers of six or more digits, and optionally for five (or even four) digits. This makes it easier to read the number without having to count how many place holders there are in the number as a whole.
6000000