Spelling Confusion
It is a common misconception that the noun login can be used as a verb. In reality, the term log in is a verb and refers to the process of identifying and authenticating the user, whereas the term login is a noun and refers to the credentials required to obtain access. (Login can also be used as an adjective, as in login name or the login page.) For systems where a user must type in a username and password, the username and password combination is their login and the act of supplying these details for validation is then logging in.
Log in is a special kind of verb called a phrasal verb. A Phrasal verb is one comprising two words consisting of (1) a verb and (2) an another part of speech, either an adverb or a preposition. Because the phrasal verb log in is used so frequently, the space is often carelessly and incorrectly dropped.
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