This is the 18368th most frequent Russian word.
эксель
"Эксель" refers to Microsoft Excel, a spreadsheet software program.
Here, 'Экcель' refers to the Microsoft Excel software and is used as a proper noun.
Я использую Экcель для анализа данных.
I use Excel for data analysis.
In this sentence, 'эксель' refers to the file format associated with Microsoft Excel software.
Он попросил отправить ему таблицу в формате эксель.
He asked to send him the table in Excel format.
Here, 'эксель' again refers to Microsoft Excel software, implying frequent usage.