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The Common Era is the calendar system used throughout most of the world today, which counts years starting from approximately the birth of Jesus Christ. It matters because it provides a shared, standardized way for people across different countries and cultures to organize and communicate about time.
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Common Era (CE) and Before the Common Era (BCE) are conventions used in the Gregorian or Julian calendar to specify years since or years before the Christian epoch. They correspond exactly to Anno Domini (AD) and Before Christ (BC): "2026 CE" is the same year as "AD 2026", as are "400 BCE" and "400 BC". BCE/CE are used to avoid religious associations by not referring to Jesus as Dominus ('Lord').