The term "Peking" is an older English name for the city that is now known as "Beijing." Both "Peking" and "Beijing" refer to the capital city of China.

"Peking" was widely used in English before the adoption of the Pinyin system of romanization, which standardized the spelling of Chinese names and replaced "Peking" with "Beijing" in the mid-20th century. In the Pinyin system, the city's name is written as "Beijing," which is now the standard and widely accepted name for the city in English.

In contemporary English, "Peking" is only associated with the historical name for the city now known as "Beijing," and specifically, it is still used in the term "Peking Duck," which refers to the famous Chinese dish. However, the correct and more widely accepted term for the city is "Beijing," and "Peking" is considered outdated.

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Reference:

Beijing - Wikipedia
Peking - Wiktionary
Peking duck - Wikipedia