Which type of malware is a program or piece of code that is loaded onto a person's computer without his knowledge and runs against his wishes?

Which type of malware is a program or piece of code that is loaded onto a person's computer without his knowledge and runs against his wishes?

میلویئر کی کون سی قسم ایک پروگرام یا کوڈ کا ٹکڑا ہے جو کسی شخص کے کمپیوٹر پر اس کے علم کے بغیر لوڈ ہوتا ہے اور اس کی خواہش کے خلاف چلتا ہے؟
Explanation

 Trojan Horse is malware that is installed on a computer without the user's knowledge and often runs malicious code.