DNA, or Deoxyribonucleic acid is its full name, is the the genetic make up of an organism. The DNA reveals how an organism will function and develop and this is why it is sometimes called a persons blueprint. So the main concept of DNA is long term information storage. DNA is usually shown as a double helix such as the picture. The double helix is stabilized by hydrogen bonds. The part of the DNA that decides your functions and development or genetic code (genes, no not the jeans you wore to school the other day) is the amino acids and proteins. Animals and plants store their DNA in cells nucleus where as bacteria store their DNA in cytoplasm. Within cells DNA is organized into structures called chromosomes. These chromosomes duplicate before the cell splits in a process called cell replication. DNA is basically a long polymer made of nucleotides. These nucleotides are formed by sugars and phosphates attached to the four bases. The four bases are cytosine, guanine, adenine and thymine. When the sugar and phosphate attach to these bases this makes the back bone of the DNA and is called a nucleotide. Although these nucleotides and strands of DNA are microscopic there can be millions of nucleotides in a single strand of DNA. Unfortunately DNA is too small to see. =( So we make it big enough to see! =)
http://www.instructables.com/id/The-Science-of-DNA/