A flicker may refer to any of the following:
1. A flicker is the appearance of flashing or unsteadiness in an image on a display screen. This issue can occur when the video refresh rate is too low, other video related issues, and in some cases hardware issues with the monitor. Commonly, when this issue occurs, users will experience more eyestrain.
2. Flicker is also a common misspelling for the online photo service Flickr.