Backward, Backwards, Forward, Forwards

Backward, forward, outward and similar words can be used as adjectives or adverbs. When these words are used as adjectives, they do not take –s.

When words like backward and forward are used as adverbs, they can be used with or without –s. Note that the forms backwards, forwards and northwards are more common in British English. Americans prefer the forms without –s.

Note that we do not use –s in expressions such as look forward to, put forward and bring forward.

I look forward to meeting you soon. (NOT I look forwards to meeting you soon.)