Adwords low search volume is a status that Google AdWords gives to a keyword with very little to no search history on Google. The keyword will be inactive until its search traffic increases, when the keyword can start triggering your ads to appear. Often this never happens, and the keywords remains tagged as Low search volume indefinitely.
If you have a lot of such keywords in your campaign, it is worth considering removing them altogether, leading to cleaner and more focused campaign.
We have a filter set up that can very quickly identify low search volume keywords for further action.
To create this filter, simply click on the Keywords tab, then (as above) Filter; Status; tick just the Low search volume box; Apply.
Below you will see an example of this filter in action. We have blanked out the keywords by the way. This shows 411 Low Search Volume keywords, with just 4 impressions in last 30 days! To remove them we simply selected them all and then Removed. This is a very useful cleaning exercise that will leave your campaign healthier and more focused.