structre object question

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Hello,
  In linux kernel source etheernet header is defined as structure as
struct ethhdr
{
        unsigned char   h_dest[ETH_ALEN];       /* destination eth addr */
        unsigned char   h_source[ETH_ALEN];     /* source ether addr    */
        unsigned short  h_proto;                /* packet type ID field */
} __attribute__((packed));
I want to know what __attribute__((packed)) meance?
       It is not looking as a structure object  then what is thati?
regards,
cranium

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