Pitch refers to the perception of relative frequency (e.g. perceptually high-pitched or low-pitched). Tone refers to significant (i.e. meaningful, constrastive, phonemic) constrasts between words signalled by pitch differences. Tone may be lexical, as in Mandarin Chinese:
 

Tone number	Description		IPA transcription example	Meaning
1	high level		[má]	妈 'mother'
2	high rising		[māá]	麻'hemp'
3	low (falling+)rising		[mǎ] or [màá]	马 'horse'
4	high fall		[mâ] or [máà]	骂 'scold'
"no tone/neutral tone"	(depends on preceding syllable)		[ma]	(question marker)

Or grammatical tone, as in many African languages, e.g. Edo:
 

Tense	Monosyllabic verbs	Disyllabic verbs
Timeless	[ì mà] 'I show'	[ì hrùlɛ̀] 'I run'
Continuous	[í mà] 'I am showing'	[í hrùlɛ̀] 'I am running'
Past	[ì má] 'I showed'	[ì hrúlέ] 'I ran'

However, there may also be non-pitch aspects of tone. Lexical tones are often related to durational, phonatory and vowel quality distinctions as well as frequency distinctions. For example, Mandarin Chinese tone 3 (low rise) is long with creaky voice, Hunanese tone 2 has breathy or chesty voice. Tibetan tone 1 words have voiceless initial consonants whereas tone 2 words have voiced beginnings. Long vowels in tone 4 or 5 open syllables in Thai are checked by a final glottal stop.

Intonation refers to the rise and fall of voice pitch over entire phrases and sentences, even in non-tone languages, such as English:

For a video of how the larynx moves up and down with pitch, see also http://www.phon.ox.ac.uk/jcoleman/fallrise-loop.m4v