A preposition is a word that tells you where or when something is in relation to something else. Examples of prepositions include words like 'after', 'before', 'on', 'under', 'inside' and 'outside'.

Enter into This is another example of prepositional tautology when it means going into a place like a house, room or car. The preposition ‘into’ is redundant and, indeed, useless in the expression.