Automatic
な adjective
An automatical (自動 + 的) thing of course isn't "automatical." A better way to say it is to cut off the -al and call it automatic.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the reading of 自動 as well.
自動的に入力する
to be inputted automatically
自動的に開く
to open automatically
自動的にできる
to be done automatically, to be made automatically
この電車のドアは、自動的には開きません。
This train's doors don't open automatically.
あの国が戦争を始めると、俺たちの国も自動的に戦うことになるんだよ。
If that country starts a war, our country will automatically be drawn into the conflict as well.
こちらに自動的にバックアップされたデータは、今度は一定期間後に自動的に消去されるシステムになっています。
The data automatically backed up here is managed by a system that will also automatically delete it after a certain period of time.