If you ever see DWR then looking into buying a jacket it means that it has Durable Water Repellency which is an extra level of waterproofing against the elements you’ll be facing out there in the wind and the rain. This is a coating that is added to jackets to increase their water resistance.
DWR does wear off over time though so if you have this on your jacket then it might need reapplying if you’ve had it for a long time. This is added to materials in conjunction with a breathable fabric to make sure that your jacket doesn’t let any water through but also making sure that the fabric can breathe as well.