diff --git a/variables.tf b/variables.tf
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+# VPC Variables
+variable "vpc_cidr" {
+  type        = string
+  description = "CIDR for the VPC"
+  default     = "10.1.64.0/18"
+}
+
+# Subnet Variables
+variable "public_subnet_cidr" {
+  type        = string
+  description = "CIDR for the public subnet"
+  default     = "10.1.64.0/24"
+}
+
+variable "windows_instance_type" {
+  type        = string
+  description = "EC2 instance type for Windows Server"
+  default     = "t2.micro"
+}
+
+variable "windows_associate_public_ip_address" {
+  type        = bool
+  description = "Associate a public IP address to the EC2 instance"
+  default     = true
+}
+
+variable "windows_root_volume_size" {
+  type        = number
+  description = "Volumen size of root volumen of Windows Server"
+  default     = "30"
+}
+
+variable "windows_data_volume_size" {
+  type        = number
+  description = "Volumen size of data volumen of Windows Server"
+  default     = "10"
+}
+
+variable "windows_root_volume_type" {
+  type        = string
+  description = "Volume type of root volumen of Windows Server. Can be standard, gp3, gp2, io1, sc1 or st1"
+  default     = "gp2"
+}
+
+variable "windows_data_volume_type" {
+  type        = string
+  description = "Volume type of data volumen of Windows Server. Can be standard, gp3, gp2, io1, sc1 or st1"
+  default     = "gp2"
+}
+
+variable "windows_instance_name" {
+  type        = string
+  description = "EC2 instance name for Windows Server"
+  default     = "windows-01"
+}
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