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Tühikud, commonly referred to as whitespace characters, are non-printing characters that appear as empty space on a screen or in a printed document. In computing and typography, these characters are crucial for readability and structure, even though they lack any visible glyph. The most common tühik is the space character, which separates words and sentences. Other forms of tühikud include tabs, which are used for indentation and aligning text in columns, and newline characters, which indicate the end of a line and the beginning of a new one.

Whitespace characters are essential in programming languages for defining code structure, separating tokens, and improving code readability. For instance, spaces and tabs are often used to indent code blocks, making it easier for programmers to understand the hierarchy and flow of their programs. Newline characters are also vital for separating statements and making code more organized. In markup languages like HTML and XML, whitespace can be significant in some contexts and ignored in others, depending on the specific rules of the language.

Beyond programming and plain text documents, tühikud play a role in various data formats and communication protocols. Their presence, or absence, can sometimes affect how data is interpreted. Understanding the different types of tühikud and their functions is fundamental for anyone working with text, code, or data processing.