There are loads of apps in the app store for this. Most have a free version so you can try first then pay a small sum to get full features like editing and emailing large files if you want them
I use Audiomemos to record all my doctor's consultations as well as memos to myself and other stuff and recently bought the full version after forgetting to turn it off and recording several hours of background noise which I then needed to edit out!
I can also download any recordings to my laptop from my ipad by using their website facility