ENI can refer to two different things: Elastic Network Interfaces and Eni, an energy company. Here is some information on both:

Elastic Network Interfaces (ENIs):

• An ENI is a logical networking component in a Virtual Private Cloud (VPC) that represents a virtual network card.
• It can have attributes such as a primary private IPv4 address, one or more secondary private IPv4 addresses, one Elastic IP Address (IPv4) per private IPV4 address, one public IPv4 address, one or more IPv6 addresses, one or more security groups, a MAC address, and a source/destination check flag.
• ENIs can be useful for creating a management network, using network and security appliances in your VPC, creating dual-homed instances with workloads/roles on distinct subnets, and creating low-budget, high available solutions.
• They can be attached and detached from instances, facilitating network management flexibility, and support various network features such as security groups, Elastic IP addresses, and Network access control lists.

Eni (energy company):

• Eni is an energy company that supports a just energy transition, with the objective of preserving our planet and promoting an efficient and sustainable energy mix.
• They have projects aimed at reaching decarbonization goals and collaborate with worldwide researchers working at Eni research centers in Italy.

In summary, ENI can refer to Elastic Network Interfaces, which are logical networking components in a VPC that represent virtual network cards, or Eni, an energy company that supports a just energy transition.