Summarize the following:
S-video cables connect a component (something that generates video, like a DVD player) with a screen (like your television). S-video input slots are circular with several small holes clustered around the middle of the port. Both your component and your TV must have S-video inputs for you to use S-video cables. This will determine which specific S video cable to buy and whether or not you will need an adapter.  S video inputs can be either 4, 7, or 9 pin. If your component S-video input has 7 holes (a 7-pin configuration) and your TV S-video input has 4 holes (a standard 4-pin configuration), for example, you'll need a 4-pin to 7-pin adapter. S-Video cables tend to be much cheaper than their high-definition counterparts.  A gold-plated connector won't oxidize over time (unlike a silver- or copper-plated connector), so while buying a more expensive cable won't affect your picture quality, it may make for longer cable life. High-quality cables are usually cheaper online than in a store. Amazon, Walmart, and Best Buy are reputable online providers. If you have multiple components that need connecting, such as a VCR and a receiver, purchase an "S-video cable splitter" in addition to more S-video cables. Splitters should cost around $5.
Make sure your television and component support S-video. Count the small holes in your TV and component S-video slots. Purchase your S-video cable. Purchase any necessary adapters at the same time.