Create a css code snippet that demonstrates the more

Question

This question is about HTML5 CSS3 specifically about tables.

The first method of "striping" (alternating colors on rows) a table is to place a class on every other (table row element) and set a style rule on that selector that applies a specified background color to that class.

Create a CSS code snippet that demonstrates the more efficient method that uses a pseudo-class selector and in the comments on that code describe the method.