I will make a little bit wider answer here.
There are generally speaking two types of conditional jumps in x86:
Arithmetic jumps - like JZ (jump if zero), JC (jump if carry), JNC (jump if not carry), etc.
Comparison jumps - JE (jump if equal), JB (jump if below), JAE (jump if above or equal), etc.
So, use the first type only after arithmetic or logical instructions:
sub eax, ebx
jnz .result_is_not_zero
and ecx, edx
jz .the_bit_is_not_set
Use the second group only after CMP instructions:
cmp eax, ebx
jne .eax_is_not_equal_to_ebx
cmp ecx, edx
ja .ecx_is_above_than_edx
This way, the program becomes more readable and you will never be confused.
Note, that sometimes these instructions are actually synonyms. JZ == JE; JC == JB; JNC == JAE and so on. The full table is following. As you can see, there are only 16 conditional jump instructions, but 30 mnemonics - they are provided to allow creation of more readable source code:
Mnemonic Condition tested Description
jo OF = 1 overflow
jno OF = 0 not overflow
jc, jb, jnae CF = 1 carry / below / not above nor equal
jnc, jae, jnb CF = 0 not carry / above or equal / not below
je, jz ZF = 1 equal / zero
jne, jnz ZF = 0 not equal / not zero
jbe, jna CF or ZF = 1 below or equal / not above
ja, jnbe CF and ZF = 0 above / not below or equal
js SF = 1 sign
jns SF = 0 not sign
jp, jpe PF = 1 parity / parity even
jnp, jpo PF = 0 not parity / parity odd
jl, jnge SF xor OF = 1 less / not greater nor equal
jge, jnl SF xor OF = 0 greater or equal / not less
jle, jng (SF xor OF) or ZF = 1 less or equal / not greater
jg, jnle (SF xor OF) or ZF = 0 greater / not less nor equal