acid n base???

what's the meaning of acid n base??i think most people even my std 4 sis can answer the question..but then,when it comes to buffer,acid base titration,it will be more complicated as i thought it so for this time being..its so confusing.ive read the notes many times,i think,but it is still not stick to my memory..not exactly rite coz i more prefer understanding than memorizing.i really hate it when ive to memorize something without knowing why i have to do so.in this case,i know the steps to solve the equation,but then,i really have no clue what im doing..its just like i just know the steps to the question,but cant explain further why im using this n that.to make it simpler,it can be assume as short term memory..hate it!!i really need to study n make the topic to be as simple as possible like i did in equilibrium chapter.ill still remember some of the thing that ive created the formula t0 memorize n understand.i shud minimizing my on9 hour like fb,ym,blogging n watever lg that mkes me more "lagho"..=p..dah2..nk study adios~~~