The two-sided market quote — bid is the price you can sell at, ask is the price you can buy at.
The bid is always below the ask; their difference is the spread. Market depth shows multiple bid/ask levels and the size resting at each.
Coral Markets publishes a full trading glossary so working traders can quickly check definitions in plain English. Every term ties back to how the concept actually shows up on MetaTrader 5 and on real charts.