A revision can be initiated only through the State Legislature or through a constitutional convention. A constitutional amendment on the other hand, may be initiated either by the State Legislature or by the voters through the exercise of the initiative power. Both must be voted on separately and be approved by a majority of the electors before they can be adopted. Its really a procedural distinction between the two methods of changing the California Constitution.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus