Question

what is self indicator

Answer 1

a self indicator is the one which acts as it own indicator of itself like

KMnO4 solutions are dark purple. When used as a titrant, as soon as the endpoint is reached and the KMnO4- is in excess, the solution has a permanent pink hue (provided that the solution is initially colorless). Thus KMnO4 acts as its own indicator

Answer 2

Indicators are the compounds which indicates the completion of reactions. They causes an abrupt change in colour as soon as the reaction completes. for example, phenolphthalein, methyl orange etc.