What it means
を marks the direct object of a verb: the person or thing that the action directly affects. It usually comes after a noun or noun phrase and before the verb. For example, in 「りんごを食べる」, を shows that an apple is what someone eats. It does not itself show whether the sentence is familiar or polite; the verb ending expresses that distinction.
Usage note
を is normally pronounced お, although it is written を. Do not confuse it with で, which commonly marks the place where an action occurs or the means used for an action.
How to use it
私はりんごを食べます。
I eat an apple.
私はりんごを食べる。
I eat an apple.
Example sentences
毎朝、新聞を読みます。
I read the newspaper every morning.
妹は図書館で絵本を借ります。
My younger sister borrows a picture book at the library.
母は台所でスープを作ります。
My mother makes soup in the kitchen.
週末に公園で写真を撮ります。
I take pictures in the park on weekends.