The libseccomp package is a Linux access control library. It provides a mechanism for filtering kernel system calls, which allows you to restrict access to certain kernel functions to improve system security. In particular, it can be useful for limiting process privileges or controlling process execution.
The specific version of the package libseccomp-2.5.2-1.amzn2.0.1.x86_64 is probably intended for the Amazon Linux 2 operating system. Version 2.5.2-1 indicates the library version, and .amzn2.0.1.x86_64 indicates that it is a build for Amazon Linux 2.0.1.
Thus, this package provides the necessary libraries to implement access control mechanisms on your system, which promotes security and privilege management.