It’s very unlikely you’ll see anything to do with terrorism while here. Yes, one of the few things pretty much everyone knows about Israel is that there are occasionally terrorist attacks. Israel is so small, especially in American terms, that if you look at a map of where an attack has happened, it looks frightfully close to, well, pretty much anywhere else in Israel.
For Israelis, though, and people in Tel Aviv in particular, there is a clear distinction between your city (or even your neighbourhood) and elsewhere. Unless something happens right on your doorstep or somewhere you frequent, Israelis tend to be far less freaked out about things, because we know we’re pretty safe. The fact is, terrorist attacks in Tel Aviv are incredibly rare. It’s probably the safest city in Israel and safer than much of the world.
You’ll notice that shopping centres, public buildings, and even the trains have security guards checking bags. This is there to stop terrorist attacks. While it might appear invasive and strange if you’re not used to it, it does have an extra layer of security. If something does happen, emergency services here are among the best in the world at both “neutralising” (i.e. killing) the terrorist quickly and offering fast, effective medical care.