Talab means quest or hunger for something.
The meaning of talab in Urdu can be compared to the word ‘Addiction’ in English.
The person who has talab (quest or hunger) is called Talib which means student ( particularly a student of islam). Taliban could be a derivation of this word and its origin is found in arabic.
Here are a few couplets that use this lafz beautifully.
Talab ki raah mein paane se pehle khona padta hai
bade saude nazar mein ho to chota hona padta hai
Rough English translation: When one is on the path of quest, one needs to lose something before gaining something; If your dreams are big, you need to lower your self to achieve them.
aashiqii sabr-talab aur tamannaa betaab
dil kaa kyaa rang karoon Khoon-e-jigar hone tak
Rough English translation: Love demands patience (is hungry for patience), but my desire is impatient; What do I do with my heart, this suffering consumes me
– Mirza Ghalib