The dash is a punctuation mark consisting of a long horizontal line. It is similar in appearance to the hyphen and minus sign but is longer and sometimes higher from the baseline.The most common versions are the en dash –, longer than the hyphen; the em dash —, longer than the en dash; and the horizontal bar ―, whose length varies across typefaces but tends to be between those of the en ... Dynamic Adaptive Streaming over HTTP (DASH), also known as MPEG-DASH, is an adaptive bitrate streaming technique that enables high quality streaming of media content over the Internet delivered from conventional HTTP web servers. Similar to Apple's HTTP Live Streaming (HLS) solution, MPEG-DASH works by breaking the content into a sequence of small segments, which are served over HTTP.