EUR/CZK is the exchange rate between the euro and the Czech koruna, indicating how many koruna one euro will buy. It is a European cross with a strong regional connection, and it trades at modest volumes, so the spread is noticeably wider than on the headline majors and pricing can thin out during quieter hours.
In this pair the euro is the base currency and the koruna the quote currency, so a quote of 25.0000 means one euro buys 25.0000 koruna. When the figure rises the euro is gaining against the koruna, and when it falls the koruna is gaining. You trade it as a forex CFD, putting on a long position if you expect the euro to outpace the koruna or a short one if you expect the reverse, without handling the underlying cash. Movements are counted in pips at the fourth decimal place, and your profit or loss equals those pips times your position size.
The koruna trades closely with the euro because the eurozone is the Czech economy's dominant trading partner, which makes EUR/CZK the koruna's principal market. The Czech National Bank is the decisive actor here, and its rate decisions relative to the European Central Bank set the tone; notably, the CNB has stepped into the market before to cap koruna strength, a reminder that intervention risk sits behind this pair.
Say EUR/CZK is trading at 25.0000 and you expect the euro to gain on the koruna, so you buy one standard lot (100,000 euros). Each pip is worth 10 koruna, so a 100-pip rise to 25.0100 produces:
100 √ó 10 = 1,000 koruna
A 100-pip drop to 24.9900 would cost 1,000 koruna. Leverage means only a fraction of the 2,500,000 CZK contract value is needed as margin, and it widens the swing in your result in both directions.