When someone calls you insulting sexual names, talks about you in a sexual way that makes you feel uncomfortable (like commenting on your body), or spreads sexual rumours about you, this is known as sexual harassment. This could happen in person, over the phone, or online.
If someone intentionally grabs or touches you in a sexual way that you do not like, or you’re forced to kiss someone or do something else sexual against your will, this is classed as sexual assault. This includes sexual touching of any part of someone’s body, and it makes no difference whether you are clothed or not.
If you are forced to have penetrative sex with someone, or someone has sex with you without your consent or agreement, this is rape.