Like

In the English language, the word like has a very flexible range of uses, ranging from conventional to non-standard. It can be used as a noun, verb, adverb, adjective, preposition, particle, conjunction, hedge, filler, and quotative.

Like is one of the words in the English language that can introduce a simile (a stylistic device comparing two dissimilar ideas) as in, "He plays like Okocha". It can also be used in non-simile comparisons such as, "He has a toy like hers".

Like is often used in place of the subordinating conjunction as, or as if. Examples:

Many people became aware of the two options in 1954, when a famous ad campaign for Winston cigarettes introduced the slogan "Winston tastes good — like a cigarette should." The slogan was criticized for its usage by prescriptivists, the "as" construction being considered more proper. Winston countered with another ad, featuring a woman with greying hair in a bun who insists that ought to be "Winston tastes good as a cigarette should" and is shouted down by happy cigarette smokers asking "What do you want — good grammar or good taste?"

The appropriateness of its usage as a conjunction is still disputed, however. In some circles it is considered a faux pas to use like instead of as or as if, whereas in other circles as sounds stilted.

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Wikipedia