Difference between "pull" and "push" data

Hi, I have heard these terms used with regards to chart data.

I see this on a website of a big charting software provider:

ProRealTime is now directly connected to ultra low latency datafeeds directly from many of the worlds' largest exchanges. In this case, the data comes directly from the exchanges to your workstation through ProRealTime (no intermediaries). These connections are in Push mode meaning that everytime a tick becomes available in the datafeed, it is displayed on your chart.
The benefits of ultra low latency datafeeds become especially apparent in high volatility markets when prices can change very quickly.

So what is "pull" data? And is one better than the other? It sounds like "push" is good, but I am not sure? What do most platforms offer?

If someone could explain just briefly the main differences between push and pull market data that would be great!

"Pull" means the client requests data from the server periodically. Your browser is a "pull" client in that it only talks to the server when requested. For something like pricing, the client would have to request data on a periodic basis, which is both slow and can delay receiving fresh prices.

"Push" is when the server sends fresh data to the client without waiting for a request from the client. MetaTrader prices are an example of pushing data, as soon as the broker gets a new price, it is sent out (or "pushed") to the mt4 client.

"Push" is better for things like price updates, where the prices can change at any time, however it is more technically complex to implement and maintain.