Canals are man-made channels for water. There are two types of canal:

Canals are created in one of three ways, or a combination of the three, depending on available water and available path:

Smaller transportation canals can carry barges or narrowboats, while ship canals allow seagoing ships to travel to an inland port (e.g., Manchester Ship Canal), or from one sea or ocean to another (e.g., Caledonian Canal, Panama Canal).

At their simplest, canals consist of a trench filled with water. Depending on the stratum the canal passes through, it may be necessary to line the cut with some form of watertight material such as clay or concrete. When this is done with clay it is known as puddling.

Canals need to be level, and, while small irregularities in the lie of the land can be dealt with through cuttings and embankments, for larger deviations, other approaches have been adopted. The most common is the pound lock, which consists of a chamber within which the water level can be raised or lowered connecting either two pieces of canal at a different level or the canal with a river or the sea. When there is a hill to be climbed, flights of many locks in short succession may be used.

Video clips are short clips of video, usually part of a longer recording. The term is also more loosely used to mean any short video less than the length of a traditional television program.

With the spread of Internet global accessing(fastest Internet broadband connection of TCP with accumulator cables and semi fast connection), video clips have become very popular online. By mid-2006^[update] there were tens of millions of video clips available online, with new websites springing up focusing entirely on offering free video clips to users and many established and corporate sites adding video clip content to their websites. With the spread of broadband Internet access, video clips have become very popular online. Whereas most of this content is non-exclusive and available on competing sites, some companies produce all their own videos and do not rely on the work of outside companies or amateurs.

While some video clips are taken from established media sources, community or individual-produced clips are becoming more common. Some individuals host their created works on vlogs, which are video blogs.