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In page Grammatical aspect:

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Although Standard German does not have aspects, many Upper German and all West Central German dialects,[citation needed] and some more vernacular forms of German do make an aspectual distinction which partly corresponds with the English continuous form: alongside the standard present tense Ich esse ('I eat') and past Ich aß ('I ate') there is the form Ich bin/war am essen/Essen ('I am/was at the eating'; capitalization varies). This is formed by the conjugated auxiliary verb sein ("to be") followed by the preposition and article am (=an dem) and the infinitive, which German uses in many constructions as a verbal noun.