What does VIABTC TX Tool actually do?

[squatz1]

I've used it for awhile and have recommended it to countless users on here but I still don't fully understand what they do in order to push someones transaction higher to be able to be confirmed. It's not that I don't know much about bitcoin or something like that, but I'm just not one to understand something like that and how the miners can pick and choose what to confirm and put first.

Thank you for helping me out and it's highly appreciated.

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[achow101]

Miners have the ability to pick and choose whatever transactions that they want to include in a block. Usually this is done by having a queue of transactions which is ordered by some "priority" metric, typically transaction fee rate. What ViaBTC and other miners with transaction accelerators do is that they will modify the "priority" value of the transaction that you enter thus bumping up the position in the queue of your transaction. This means that your transaction will be more likely to be selected for the next block because it has a higher "priority" than other transactions that pay the same fee rate.