When we create Lambda functions, they might be dependent on many different types of infrastructure resources, such as AWS, DynamoDB or AWS S3, so we can define these resources within the serverless.yml file and deploy them. When we add these resources, they get added to the serverless.yml file, and when they are deployed, they get added to the CloudFormation stack and are executed at serverless deploy. We can look at the following example to see how these resources are defined:
resources: Resources: NewResource: Type: AWS::S3::Bucket Properties: BucketName: my-s3-bucket