CEST stands for Central European Summer Time. It is always UTC+2.
CEST is daylight saving time. The rest of the year the same areas use CET (UTC+1).
Right now Paris uses CET (UTC+1), not CEST.
Where CEST is used
Albania, Andorra, Austria, Belgium, Bosnia & Herzegovina, Croatia, Czechia, Denmark, France, Germany, Hungary, Italy, Liechtenstein, Luxembourg, Malta, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Vatican City.
In some of these countries CEST is used only in part of the country or only part of the year.