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
それは、ボットによる自動的なツイートですよ。
That's an automated tweet by a bot.
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.
もし誰かがあなたの家に侵入したら、この機械が自動的に警備会社に通報します。
If someone breaks into your house this machine will automatically send a message to the security company.