Which type of research is conducted from existing information compiled by others?

The choice of secondary research is appropriate because it specifically involves the collection and analysis of data that has already been gathered by other sources. This type of research relies on existing information, which may include reports, studies, articles, and datasets, allowing researchers to gain insights or establish a foundation for further inquiry without collecting new data.

In contrast, primary research is conducted to gather new data directly from participants or through experiments, making it distinct from secondary research. Qualitative research focuses on understanding phenomena through non-numerical data, often exploring people's thoughts and feelings, and can be conducted using primary data sources. Exploratory research aims to identify patterns and generate ideas but can apply to both primary and secondary data; however, it does not specifically denote the use of existing information. Therefore, secondary research stands out as the correct answer, as it encapsulates the essence of utilizing existing data compiled by others.