A company logo is often considered the most critical element of a corporate brand. Stocklogos.com, an identity design community that offers high-quality logos, has compiled a list of before-and-after logos for 20 of the biggest brands.

Check out how these famous brands have altered their logos -- for better or for worse -- since they originally opened their doors. The history of the logos was collected from Logopedia.

Read the whole story at Yahoo! Finance