love is a strong connection between two individuals that can have a sexual connotation but is not limited to one. love is the tie that binds friends family and communities.
lust is a completely biologically-based sexual feeling that serves to fulfill reproductive urges.
the big difference between the two is that love is an emotion and lust is an urge. while the two are often experienced together, both can be felt separately without any hint of the other.
for example: you see a person on the street that catches your eye and you immediately fantasize about having sex with them. just because you are attracted to them and are smitten with lust does not neccessarily mean that you care about their well being and have a strong emotional bond with them.
the converse is also true. you have strong feelings of love for you family (most people do anyway) but you do not want to have sex with them. this is also true of close friends. we all have had a friend or two that we could never picture having sex with. (this is especially true in hetero friendships with the same sex and gay male/ straight female friendships, or vice versa).
lust can be the first step to achieving love with someone. it makes you want them and when the lust is over it will either become love or you will just move on. lust can confuse people into believing they love someone because of the heightened emotions of happiness involved with lust but one should wait to see if the relationship goes further.
Love is caring about someone. Yo don't want anything bad happen to them and you just want to hold them close. You dont need to have actual sex to feel good around them. You could just lay holding them all day long and you would feel alright.
Lust is different. You feel it only for a short time and you want way more than a hug from the person. A hug would only make the lust grow and wouldn't make you calm.
The common thing is that its about people and it makes you crave their touch.
The biggest difference is you dont really care about the person if its all about lust. You care only about your physical needs. If its love the person is more important than your needs.