Explanation:

 Documents must be proved by primary evidence except in the cases hereinafter mentioned. Primary evidence is evidence which the law requires to be given first. Secondary evidence is evidence which. may be given in . the absence of primary evidence. This section is based upon the principle that the "best evidence in the possession ofpower of the party must be produced. What the best evidence is, it will depend on the circumstances. Generally speaking, the original document is the best evidence. The content can only be proved by the writing itself