You can try some AWS services free of charge within certain usage limits. AWS calls this the AWS Free Tier . The Free Tier is designed to give you hands-on experience with a range of AWS services at no charge. When you create an AWS account, you're automatically signed up for the Free Tier for 12 months.
So you have to take care of that which service is free. Most common services that comes under Aws Free Tier are EC2, S3 etc.