™A session with 1 million shares traded measures transactions in that interval; it does not by itself tell whether more investors were buying than selling.
Trading
Volume
The number of shares or contracts traded during a period.
Plain-English context
Put the definition to work.
Each completed transaction has both sides. Rising volume does not establish more completed purchases than sales.
Further reading and verification. Examples are hypothetical, not current quotes or recommendations. Product terms, tax treatment and market rules can change. FINRA — order types and execution