The equivalence point, or stoichiometric point, of a chemical reaction occurs during a chemical titration when the amount of titrant added is equivalent, or equal, to the amount of analyte present in the sample. In some cases there are multiple equivalence points which are multiples of the first equivalent point, such as in the titration of a diprotic acid. A graph of the titration curve exhibits an inflection point at the equivalence point. A striking fact about equivalence is that in a reaction the equivalence of the reactants as well as products is conserved.

The end point (similar, but not the same as the equivalence point) refers to the point at which the indicator changes color in a colorimetric titration.

To summarise and relate to our titration practicals, the equivalence point and the end point is actually the same, but the equivalence point is a much broader and general term used in chemical reactions which includes titration invloving pH indicator, redox, precipitation, conductivity of a solution, etc. However, the end point is only applicable to titration invloving pH indicator. Also, the end point in a titration involving pH indicator is an approximate value of its euivalence point.

pH indicator
This is a substance that changes colour in response to a chemical change. An acid-base indicator (e.g., phenolphthalein) changes colour depending on the pH. Redox indicators are also frequently used. A drop of indicator solution is added to the titration at the start; when the colour changes the endpoint has been reached, this is an approximation of the equivalence point.

[Source of research information - http://en.wikipedia.org/wiki/Endpoint_(chemistry)]