Content analysis is a research technique used to objectively, systematically, and quantitatively analyze the manifest content of communications. It can be used to analyze any type of recorded media, such as text, images, or videos. There are two main types: conceptual analysis, which establishes the frequency of concepts, and relational analysis, which examines relationships between concepts. Content analysis is useful for reducing large amounts of unstructured data, identifying important aspects of content, and making inferences about messages, authors, and cultural contexts. While it provides an unobtrusive means of analysis, it can also be time-consuming and reductive when dealing with complex materials.