What typically characterizes real-time market data?

Real-time market data is characterized by its delivery with insignificant delay, allowing traders and investors to access the most current information about stock prices, trading volumes, and other market metrics as they happen. This immediacy is crucial for making timely trading decisions, as even slight delays can result in missed opportunities or unfavorable trades.

The other options do not accurately represent real-time market data. Access at the end of the trading day refers more to end-of-day data, which is not real-time. Aggregation from multiple sources refers to a different concept that can apply to various types of data, but it does not inherently define real-time market data, which is focused on immediacy. Filtering for accuracy may be a component of data preparation but is not a defining feature of real-time data, where the priority lies in the timeliness of the information received rather than a complex accuracy checking mechanism.