What MaineDesigner is referring to is a windbreak. In order for a windbreak to be the most effective in our region, much thought must go into the creation of same.
As a rule of thumb, windbreaks should be placed about 100' from the NW corner of one's home and should consist of mixed species of both evergreen and deciduous woodies.
Although conifers can help provide much needed habitat for many species of critters while multitasking to afford privacy, improperly planted species can have the opposite effect on those strong winter winds we'd all love to break up.
The windbreak I have on my property is a work in progress and I am constantly adding to it based on my drawings. It was designed to multi-task in that it is a windbreak utilizing species chosen for maximum wind reduction however species were also chosen based on the fauna indigenous to my area. My windbreak utilizes mixed native woodies exclusively which happen to be the best adapted to this region anyway so the odds of them being able to perform for me for many years to come are greatly increased. Best guess is that I should begin benefiting from its existence in about 10 years. At that time, I'll also begin to enjoy the privacy it will afford as the area directly behind it is a wetland that is in the process of being cleared of invasives. Once that wetland is restored and the crack willows and other nasties are removed, there would have been a clear visual path to my home... not any more.
biwa, your photos aren't enlarging. Looks a little bit like you could have a Ligustrum there but images are way too tiny to see in thumbnails. Maybe MD can get your thumbnails to enlarge to take a peek. He'd be able to identify what you have growing there.