Very similar to
Czech, and sharing the same alphabetic conventions, even to I and Y being pronounced the same except that I
palatalizes some previous
consonants.
Letters peculiar to Slovak are Ä, now pronounced the same as E; L-hook for a palatal L; Ô pronounced WO; and L-acute and R-acute for long syllabic resonants. These long L and R are the last survivors in Indo-European languages of rare sounds believed to have been in the ancestral Proto-Indo-European.
Here are the Unicode numbers for the letters that can't be expressed in HTML (extracted from my Using Unicode in HTML):
Č Č č č C-hacek
Ď Ď ď ď D-hook
Ĺ Ĺ ĺ ĺ L-acute
Ľ Ľ ľ ľ L-apostrophe
Ň Ň ň ň N-hacek
Ŕ Ŕ ŕ ŕ R-acute
Š Š š š S-hacek
Ť Ť ť ť T-hook
Ž Ž ž ž Z-hacek