Liaison refers to the linking of the final consonant of one word with the beginning vowel (a, e, i, o, u) or vowel sound (generally, h and y) to the following word, as in the following example: vous imitez (voo zee‐mee‐tay).
Note how pronunciation of the final “s” of vous takes on the sound of “z” and combines with the pronunciation of the beginning “i” of imitez.
Elision usually occurs when two vowel sounds are pronounced: one at the end of a word and the other at the beginning of the next word. Drop the final vowel of the first word and replace it with an apostrophe. The two words then simply slide together: je + imite = j'imite (zhee‐meet).
Note how the final “e” (uh) sound of je (zhuh) is dropped.