"إلى" is a preposition in Arabic that translates to "to" in English. It is used to indicate direction, destination, or purpose. For example, when someone says "أذهب إلى المدرسة" (I go to المدرسة), it shows the direction towards the school. Additionally, "إلى" can express time, such as in "من الساعة 5 إلى 7" (from الساعة 5 to 7). It helps clarify the range or limit of time or space in a sentence, making it an essential part of Arabic grammar for conveying movement and relationships between objects or events.