An ode is a short version of lyric poetry. Odes were originally sung or chanted with a musical instrument, especially in ancient Greece. Odes are often performed to praise and glorify people, things, or events. Thus, they are typically formal or ceremonial in tone.
Acrostic poems are a form of poetry that spell out a word or message in the first letter, word, or occasionally syllable of each line in the poem. Some acrostics spell out the alphabet instead, but the core principle of using the beginning of the line to spell something out remains the same.