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'ls -1' (that's the number one) gives you a listing of all the files in a single column, good for counting. A regular 'ls' will output the listing with spaces between the filenames, but the listing goes across so it's (slightly) harder to count the number of files.
the 'wc -l' command counts lines fed to it, as opposed to just counting words. You could use the regular 'ls' command and pipe the output to 'wc' with no -l option, but it would miscount files that had spaces in their names. If none of your files had spaces then you could use the command like this:
ls | grep '^Foo.*' | wc
However, the output of 'wc' without the -l option includes the number of lines, bytes, and words, so you'd have to know what to look at to pull out the value you need. The original method is more direct and could be fed to something else that just needed the line count.