Confusion about acidosis and alkalosis? please help!!!?

i have been doing so much research on this, getting bits and pieces together. I thought i understood it, well i went to so many different websites and they say the oppostite i swear! could somebody please tell me what the difference between acidosis and alkalosis is/are? (main thing i need to know about the blood ph) isnd acidosis- high in blood ph and alkalosis HIGH? geez i am so confused now those stupid websites./....thanks for any help