Just type "read.csv" and it will show you the details of the function:
read.csv
#> function (file, header = TRUE, sep = ",", quote = "\"", dec = ".",
#> fill = TRUE, comment.char = "", ...)
#> read.table(file = file, header = header, sep = sep, quote = quote,
#> dec = dec, fill = fill, comment.char = comment.char, ...)
#> <bytecode: 0x00000000116c8828>
#> <environment: namespace:utils>
Created on 2020-01-09 by the reprex package (v0.3.0)