The infinitive in this sentence is "to keep." It is the base form of the verb "keep."
On a computer, a bookmark is a saved spot. A bookmark shows a place you were reading and then puts a marker there so you can quickly access it again when you want.
bookmark
An infinitive phrase can takes the place of a noun by being put in the place of the subject of a sentence.For example in the following sentence an infinitive phrase takes the place of a noun:To neglect your education is a terrible thing.
You can keep your favorites by marking them bookmarks. Bookmark is a thing which is used to reload webpages easily.
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A bookmark inside a webpage is the specific location which is used to go to the particular page resides on that website.
A zu-infinitive is a German infinitive form created by adding or infixing the particle zu and used in subordinate clauses.
A bookmark is used in a book to mark a reader's place so they can easily return to where they left off. It helps to keep track of the pages that have been read and helps to resume reading from the same spot without having to search within the book.
The word 'to' can function as both a preposition and an infinitive marker. As a preposition, it is used to show direction or position. As an infinitive marker, it is used before a verb to form an infinitive phrase.
a gerund is a verb used as a noun that ends in -ing and an infinitive is a verb used as an adjective and often ends in -ing or -ed
infinitive: Characteristics of a verb used with the word to - that is how a simplified the definition in the dictionary Hope it helps
The first bookmarks were likely invented in the 6th century by early Christians who used small leather or fabric markers in their Bibles. These early bookmarks were primarily used to help readers keep track of important passages in their religious texts.