DIY or Do it yourself is a method of home improvement, where the home owner gets materials and tools for themself, then does the work on their own, without professional help.
DIY can also mean using any skill to do work or a hobby for fun and not hire help. An example is an activity in arts and crafts. A DIY culture is also used in the alternative rock, punk rock, and indie rock music scenes; and in the zine community.
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DIY Facts for Kids. Kiddle Encyclopedia.