A "spelling error" occurs when a word is written incorrectly, often due to mistakes in letter arrangement, omission, or addition of letters. These errors can happen in various contexts, such as in writing, typing, or even in digital communication. Common examples include mixing up letters, like writing "definately" instead of "definitely," or using incorrect forms, such as "their" instead of "there." Spelling errors can affect the clarity and professionalism of written communication. They are often identified through proofreading or spell-check tools in software like Microsoft Word or Google Docs. Correct spelling is important for effective communication, as it helps convey the intended message accurately.