Morphologically it’s the most developed system including all the categories of the verb.
Semantically it’s a fact mood.
It serves to present an action as a fact of reality. It’s the most objective of all the moods. It conveys minimum personal attitude to the fact:
Ex. Water consists of oxygen and hydrogen.
Indicative means "stating a fact." The indicative mood is a category of verb forms that we use to state facts.
Ex: "Joe plays outside." (The speaker thinks it's a fact.)
The Indicative has no special forms of expression – it is all the tenses in active and passive.
The Imperative mood
The Imperative mood is used to express inducement to action, which means that the speaker considers the action as desirable. The use of the Imperative mood is restricted to only one communicative type of sentences - imperative sentences. Eg: "Go outside!" (This is a command.)
Has no person, number, tense, aspect, it’s limited to one type of sentence only.
– Usually a verb in the imperative sentences has no pronoun, but may be used in emotional speech. – e.g. You leave me alone!
The Imperative mood expresses a command or a request to perform an action addressed to somebody, but not the action itself. It doesn’t actually denote a specific action it has no tense category; the action always refers to the future.
The Imperative mood form coincides with the plain stem of the verb.
e.g. – Come here! Sit down
The negative form is built by means of the aux. DO:
E.g. Don’t be a fool. Don’t worry.
Emphatic requests\commands:
E.g. Do come and stay with us. Do be quiet.
Commands and requests addressed to a second person.
The imperative mood is used only in imperative sentences and can’t be used in questions.